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Subject: Questions for potential converter to MF
Date: 2011-08-05 11:37:34
From: joetunon@bellsouth.net
I just recently saw some MF slides through an MF viewer. Wow! I may take the jump from digital into film (even though everyone seems to be moving in the opposite direction) for the sake of such beautiful detail. So a few questions before considering the plunge:

How long does it take to have your film processed?

Can you get multiple prints (and negatives for future reprints)?

Does anyone have any MF stereo slide for sale? (I have yet to see any on eBay, but I've seen some samples from John, who was nice enough to lend me a viewer and some pics to whet my appetite!) I'm interested in at least enjoying some stereoviews while I learn about the TL120.

Given that I would be completely new to film photography, I know I can use my W3 to get some sample settings (aperture and shutter speed), but are there any safe "default" settings for sunny, cloudy, indoors, and night shots that I could begin with, in the interest of avoiding too many wasted shots as I learn the ropes?

And finally, what are your honest opinions about whether handheld digital viewing will catch up to film regarding the fine detail?

Thanks, everyone!
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 11:51:51
From: Dan Vint
At 10:37 AM 8/5/2011, you wrote:
>"default" settings for sunny, cloudy, indoors, and night shots that
>I could begin with, in the interest of avoiding too many wasted
>shots as I learn the ropes?

Sunny 16 and Moony 11

That is in full sun set the camera at f16 and 1/film speed, so if you
shoot 100ASA film use a film speed of 1/100 which the closest is 1/125

For a full moon night you would then use a starting point of f11

FYI film processing time depends on the town you live in and what you
want to spend. Back in the day if you had a local processor or custom
lab you could easily get any where from 1hr to same day service. It
is getting to the point where most locations are dependant on mail
order processing, which adds some unknowns due to the post office.

..dan

---------------------------------------------------------------------------
Danny Vint

Panoramic Photography
http://www.dvint.com

voice: 619-938-3610
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 13:19:03
From: Brian Reynolds
joetunon@bellsouth.net wrote:
>
> How long does it take to have your film processed?

That depends on the lab you use.

My lab (Manhattan Color Labs in Manhattan, New York) processes E6
film, including push/pull, in a few hours. Adding a machine scan (see
below) would add to that time. In reality this turns out to be same
day processing as the fastest I could turn the film around would be to
drop it off in the morning on the way to work and pick it up on the
way home.

> Can you get multiple prints (and negatives for future reprints)?

Most people shoot slide film, no prints. If you have the film scanned
you can print from the digital files.

> Does anyone have any MF stereo slide for sale? (I have yet to see
> any on eBay, but I've seen some samples from John, who was nice
> enough to lend me a viewer and some pics to whet my appetite!) I'm
> interested in at least enjoying some stereoviews while I learn about
> the TL120.

Boris has sold some slides in the past. The 3D World folks used to
sell some sampler sets.

The best way to see most MF3D is to join a folio. Most folios expect
you to submit slides to the folio (not viewing aonly).

> Given that I would be completely new to film photography, I know I
> can use my W3 to get some sample settings (aperture and shutter
> speed), but are there any safe "default" settings for sunny, cloudy,
> indoors, and night shots that I could begin with, in the interest of
> avoiding too many wasted shots as I learn the ropes?

You could use a digital camera to meter for your film camera, but
you'll want to test to make sure the cameras "see" the scene the same
way. If nothing else you want the cameras to have the same field of
view.

I found that my Pentax K-20D at ISO 200 is very good for figuring out
exposures on my Sputnik with Kodak E100G pushed a stop, but that it is
easier to carry around a small Sekonic L-308 light meter.

> And finally, what are your honest opinions about whether handheld
> digital viewing will catch up to film regarding the fine detail?

I doubt it will happen. Consumer products advance until they readh
the level of "good enough", and then they stop.

--
Brian Reynolds | "It's just like flying a spaceship.
reynolds@panix.com | You push some buttons and see
http://www.panix.com/~reynolds/ | what happens." -- Zapp Brannigan
NAR# 54438 |
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 13:19:05
From: George Themelis
> Does anyone have any MF stereo slide for sale?

Yes, I have a large quantity of MF stereo slides for sale, mostly scenic but
some glamour too. Most come in sets of 10 with one topic. These come from
3-D World, the company that makes the TL-120 camera, viewers and mounts.
Because they cannot buy MF copying film, they do not produce these slide
sets any more, but I have a stock here, I just need time to organize it.

I also sell all the 3-D World products: TL-120 camera, simple viewer,
lighted viewer, exhibition rotary viewer, MF mounts.

Thanks,

George Themelis
http://www.drt3d.com/
http://shop.ebay.com/merchant/3d-drt-3d
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 14:59:45
From: joetunon@bellsouth.net
> Most people shoot slide film, no prints. If you have the film scanned
> you can print from the digital files.

What I meant was duplicate slides, not paper prints (unless by prints you mean slides as well). And speaking of printing from digital files, how about creating slides from W3 pictures? Do these come out anywhere near the quality of film exposed pictures?

> The best way to see most MF3D is to join a folio. Most folios expect
> you to submit slides to the folio (not viewing aonly).

Here again is where lack of duplicates would be a concern. So, if you develop slide film into slides, you can only get one set of pics, not duplicates?

> I doubt it will happen. Consumer products advance until they readh
> the level of "good enough", and then they stop.

Ain't that the truth.
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 15:10:04
From: joetunon@bellsouth.net
> Yes, I have a large quantity of MF stereo slides for sale, mostly scenic but
> some glamour too. Most come in sets of 10 with one topic. These come from 3-D World, the company that makes the TL-120 camera, viewers and mounts.

I'm interested in purchasing. Can you please email me a list of available sets?

> I also sell all the 3-D World products: TL-120 camera, simple viewer,
> lighted viewer, exhibition rotary viewer, MF mounts.

I'm seriously considering these as well. I currently use the W3 and I am very pleased with the Cyclopital3D Lighted Print Viewer's immersive field of view. It is quite wider than MF (and sooo immersive!), but obviously the fine detail of an MF slide smokes the paper printouts. So it's not a weakness of the C3D viewer, but of the prints. I held up an MF slide to the C3D viewer and it looked even better than the MF viewer! Ken, maybe a future steal-the-light MF attachment for the LPV? ;-)

What I'm after, quite frankly, is MF slide quality in a handheld, and if MF is the only way to get it, I may have to bite the bullet and spring for the camera, though obviously my wallet would prefer if there was some way of getting there (or close to there) with the W3.
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 15:17:07
From: John Thurston
joetunon@bellsouth.net wrote:
>> Most people shoot slide film, no prints. If you have
>> the film scanned you can print from the digital files.
>
> What I meant was duplicate slides, not paper prints
> (unless by prints you mean slides as well). And speaking
> of printing from digital files, how about creating slides
> from W3 pictures? Do these come out anywhere near the
> quality of film exposed pictures?

Duping MF3D slides is very difficult.
I have seen some contact-dupes which weren't bad, but
finding someone with the skills to make them is not easy. I
have also been told (two weeks ago) that even 4x5 duping
film is being discontinued.

I have tried scanning my slides and sending back through a
film-recorder. The results varied between acceptable to
disappointing. They're better than nothing, but hard to make.

There are insufficient bits in the W3 images to make
acceptable MF3D slides (at 4Kx4K for the lower-res film
recorders, you'd want 16 megapixles per chip). Even if there
were sufficient bits, I don't think the lens or sensor
quality is there to make it worthwhile.

[I may get flamed for that statement. I have seen terrific
images from the W1/W3. But in those images, I have
frequently seen the artifacts of low-cost digital imaging:
low contrast, streaking, color fringing. I would not use my
money to try pushing them out to medium format film. I've
thought about sending some images from my canon 7D out to
MF3D, but don't think I'd try to send anything smaller.]

>> The best way to see most MF3D is to join a folio. Most
>> folios expect you to submit slides to the folio (not
>> viewing aonly).
>
> Here again is where lack of duplicates would be a
> concern. So, if you develop slide film into slides, you
> can only get one set of pics, not duplicates?

That's it. When I send you a box of slides, they are one-off
originals. If you munge the box, those images are gone. This
is a significant factor in the folios circulating only among
contributers. Most contributers want to have some assurance
that their images will be handled by others with "skin in
the game" and will treat them with care.

--
John Thurston
Juneau Alaska
http://stereo.thurstons.us
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 15:21:58
From: John Thurston
joetunon@bellsouth.net wrote:
- snip -
> What I'm after, quite frankly, is MF slide quality in a
> handheld, and if MF is the only way to get it, I may have
> to bite the bullet and spring for the camera, though
> obviously my wallet would prefer if there was some way of
> getting there (or close to there) with the W3.

I don't think you are the only one seeking this.

The only way to get the image quality of MF3D is with a
large slide in a hand-viewer. To get this costs a lot of
money up front, a lot of time and care in image creation,
and the recognition that it isn't easily sharable.
--
John Thurston
Juneau Alaska
http://stereo.thurstons.us
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 15:52:08
From: Brian Reynolds
I wrote:
> joetunon@bellsouth.net wrote:
> >
> > Given that I would be completely new to film photography, I know I
> > can use my W3 to get some sample settings (aperture and shutter
> > speed), but are there any safe "default" settings for sunny, cloudy,
> > indoors, and night shots that I could begin with, in the interest of
> > avoiding too many wasted shots as I learn the ropes?
>
> You could use a digital camera to meter for your film camera, but
> you'll want to test to make sure the cameras "see" the scene the same
> way. If nothing else you want the cameras to have the same field of
> view.
>
> I found that my Pentax K-20D at ISO 200 is very good for figuring out
> exposures on my Sputnik with Kodak E100G pushed a stop, but that it is
> easier to carry around a small Sekonic L-308 light meter.

Something I forgot.

The "Sunny 16" rule is based on a sunny summer day in northern
latitudes. Set your shutter speed to 1/ISO and aperture to f/16.
There are various guidelines for changing the settings depending on
conditions (cloudy day, shade, etc.)

A popular web page is Fred Parker's Ultimate Exposure Computer:

<http://www.fredparker.com/ultexp1.htm>

The wikipedia page provides other references:

<http://en.wikipedia.org/wiki/Sunny_16_rule>

If you have a iOS device (iPhone, etc.) I find the Expositor app to be
very useful.

--
Brian Reynolds | "It's just like flying a spaceship.
reynolds@panix.com | You push some buttons and see
http://www.panix.com/~reynolds/ | what happens." -- Zapp Brannigan
NAR# 54438 |
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 16:01:33
From: joetunon@bellsouth.net
> That's it. When I send you a box of slides, they are one-off
> originals. If you munge the box, those images are gone. This
> is a significant factor in the folios circulating only among
> contributers. Most contributers want to have some assurance
> that their images will be handled by others with "skin in
> the game" and will treat them with care.

This only makes me appreciate MF that much more, then. And I thank you for letting me see the images first hand.
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 16:16:31
From: Brian Reynolds
John Thurston wrote:
> joetunon@bellsouth.net wrote:
> - snip -
> > What I'm after, quite frankly, is MF slide quality in a
> > handheld, and if MF is the only way to get it, I may have
> > to bite the bullet and spring for the camera, though
> > obviously my wallet would prefer if there was some way of
> > getting there (or close to there) with the W3.
>
> I don't think you are the only one seeking this.
>
> The only way to get the image quality of MF3D is with a
> large slide in a hand-viewer. To get this costs a lot of
> money up front, a lot of time and care in image creation,
> and the recognition that it isn't easily sharable.

I have to disagree here.

It does not take a lot of money up front to get into MF3D. A Sputnik
(even if you pay someone else to fix it up) costs a lot less than a 3D
World TL120 camera. At the typical apertures used in MF3D (f/16 -
f/22), with proper technique (tripod, bean bag, or other steady
support, good metering, etc.), you probably won't see any difference
between a Sputnik and the TL120. Just be aware that you will have to
work on the Sputnik to get it in tune.

--
Brian Reynolds | "It's just like flying a spaceship.
reynolds@panix.com | You push some buttons and see
http://www.panix.com/~reynolds/ | what happens." -- Zapp Brannigan
NAR# 54438 |
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 16:18:27
From: Brian Reynolds
joetunon@bellsouth.net wrote:
> Brian Reynolds wrote:
> > The best way to see most MF3D is to join a folio. Most folios expect
> > you to submit slides to the folio (not viewing aonly).
>
> Here again is where lack of duplicates would be a concern. So, if
> you develop slide film into slides, you can only get one set of
> pics, not duplicates?

Yes, although there are ways to have duplicates made. Boris had some
nice duplicates in the folio I manage. Prehaps he'll pipe up with the
details.

People sometimes shoot duplicates in camera. Or you might find that
if you bracket that more than one version is acceptable.

In the approximately ten years that I've managed the MF3D Folio II
only one slide has ever been lost, and it was mine. Luckily it was a
pinhole test slide and not something irreplaceable. However, I do
seem to recall hear that the US Post Office lost an entire folio.

--
Brian Reynolds | "It's just like flying a spaceship.
reynolds@panix.com | You push some buttons and see
http://www.panix.com/~reynolds/ | what happens." -- Zapp Brannigan
NAR# 54438 |
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 17:58:42
From: John
--- In MF3D-group@yahoogroups.com, "joetunon@..." wrote:
> And finally, what are your honest opinions about whether handheld digital viewing will catch up to film regarding the fine detail?

Pure speculation here, but WTF:

1) Handheld digital (or HMD) vs. original MF transparency equivalence, probably not in my lifetime (but I'm pretty old...). There is no demand (beyond HD) for such a device. Maybe HD handhelds (which is on the margin of greatness, especially for motion 3D) someday. But what will these things be marketed for: The Smurfs?

2) 4K digital displays can deliver the MF experience (but ain't gunna be handheld, and won't be consumer available for a year or more, and won't initially be affordable). Few people have material for these (W3, most routine film-scans, etc., won't cut it). IMHO better than handheld 'cause they are open-view, multiple viewer, etc., but cost-wise, no comparison.

3) The Art Gallery at NSA provides a nice venue to check out a lot of different high-Q formats. Large prints are very good (like the David Lee award-winning mirror-view print display). MF film-recorder, and MF dupes are similar in quality (maybe a little better than 35mm orignal hand-views, but not as good as MF originals).

If you like the hand-viewing experience (solo, small group, limited sharing, slow-go), and your favorite subjects are compatible with the MF format cameras, go for it.

John
Subject: Re: Questions for potential converter to MF
Date: 2011-08-05 19:29:05
From: Bill G
Very well articulated John.... I sadly agree :-(


> Pure speculation here, but WTF:
>
> 1) Handheld digital (or HMD) vs. original MF transparency equivalence, probably not in
> my lifetime (but I'm pretty old...). There is no demand (beyond HD) for such a device.
> Maybe HD handhelds (which is on the margin of greatness, especially for motion 3D)
> someday. But what will these things be marketed for: The Smurfs?
>
> 2) 4K digital displays can deliver the MF experience (but ain't gunna be handheld, and
> won't be consumer available for a year or more, and won't initially be affordable). Few
> people have material for these (W3, most routine film-scans, etc., won't cut it). IMHO
> better than handheld 'cause they are open-view, multiple viewer, etc., but cost-wise, no
> comparison.
>
> 3) The Art Gallery at NSA provides a nice venue to check out a lot of different high-Q
> formats. Large prints are very good (like the David Lee award-winning mirror-view print
> display). MF film-recorder, and MF dupes are similar in quality (maybe a little better
> than 35mm orignal hand-views, but not as good as MF originals).
>
> If you like the hand-viewing experience (solo, small group, limited sharing, slow-go),
> and your favorite subjects are compatible with the MF format cameras, go for it.
>
> John
>
>
Subject: Re: Questions for potential converter to MF
Date: 2011-08-06 01:23:51
From: Bob Venezia
I'm going to weigh in on several things stated in this post.

Dan Vint mentioned sunny 16 and moony 11. I'm good with sunny 16. But
moony 11? Maybe I'm missing something here.

If you are photographing the full moon, use sunny 16. If you are
photographing a scene lit by the full moon, it would probably be at
least 1/2 hour at f16 using ISO 100 film. And you could easily go
longer.

Brian Reynolds mentioned a couple things that I'd like to address. A
well-tuned sputnik can be a wonderful camera, and a great, inexpensive
starter for MF3D. But can anyone here recommend a tech who will fine-
tune a sputnik? I have a friend in need of such service. And while
it's a fine camera, the TL-120 is an awesome camera. The lenses are
wickedly sharp.

Brian also mentioned that Boris Starosta had some good MF dupes in his
folio. The subject matter of Boris' slides is indeed fantastic. But
the quality of the dupes is nowhere close to a medium format original.
Very fuzzy by comparison.

The very best MF dupes I have seen were John Hart's dupes of his
fractals and colored water droplets shown at the gallery in Loveland
last month. That was the first I'd seen an MF dupe that impressed me.
John, perhaps out of modesty, did not mention his own slides. I
believe they were done by Gammatech. And maybe John could weigh in on
how he achieved such a stunning result. Sharp and vibrant.

But Joe, if you have seen what medium format can be, and it excites
you, I say go for it. I used to use a spot meter but now more often
use a p/s digital for a light meter. My canon G9 has a small aperture
of f8 but also has a 3-stop ND filter so I can mimic f22 and get a
good histogram reading. I often make in-camera dupes so I don't mind
sharing my good shots in the folios.

I look forward to sharing slides with you.

Bob Venezia
Seattle, Washington
Subject: Re: Questions for potential converter to MF
Date: 2011-08-06 01:56:47
From: John Thurston
Bob Venezia wrote:
- snip -
> The very best MF dupes I have seen were John Hart's dupes of his
> fractals and colored water droplets shown at the gallery in Loveland
> last month. That was the first I'd seen an MF dupe that impressed me.

These, I think, are superior to other "dupes" we have seen
because they are actually first-generation "dupes". When John
creates his digital files, he knows everything in his image
and can control the color and contrast in the image. If he
creates his images in the sRGB space (which Gamma Tech's film
recorders use), then he knows the colors will be available.

> John, perhaps out of modesty, did not mention his own slides. I
> believe they were done by Gammatech. And maybe John could weigh in on
> how he achieved such a stunning result. Sharp and vibrant.

If you refer to my gallery display, the results were
relatively easy to achieve.... I displayed originals and
hoped like hell that no one spilled drinks on them.

If you refer to my small box of dupes (I had three at the
convention along with their originals), I actually carry
those around as examples of disappointment. After investing
weeks of work (and a several hundred dollars in software and
production costs), I had one dupe'd slide I wouldn't be
ashamed to submit to a folio. The others are interesting to
trot out as a parlor trick, but like a three dollar bill,
would never pass for real.

Yoshi, however, had some very good looking dupe'd slides. He
told me he had a friend retired from Minolta who had helped
with the scanning and film-recorder work. I don't have the
scanning skills to do the same.

I still think that scanning and film-recording holds the best
promise for duplicating MF3D, but my results are too weak for
the required time, money and effort. I don't intend to pursue
it further.
________________________________________
John Thurston
Juneau, Alaska
http://stereo.thurstons.us
Subject: Re: Questions for potential converter to MF
Date: 2011-08-06 02:14:27
From: Bob Venezia
>
Subject: Re: Questions for potential converter to MF
Date: 2011-08-06 07:37:44
From: Linda Nygren
----- "Bob Venezia" <bob@chairboy.com> wrote:
> I'm going to weigh in on several things stated in this post.
>
> Dan Vint mentioned sunny 16 and moony 11. I'm good with sunny 16. But
> moony 11? Maybe I'm missing something here.

Moony 11 is not a phrase I have previously hear of, but it is apparently referring to photos _of_ the full moon, not photos of the earth illuminated by moonlight. Since the moon is actually in sunlight, it is really part of the sunny 16 rule. Some recommend f16 for fully zoomed in clear sky full moon shots rather than f11. Not something one would be likely to do with MF stereo. 8-) But there is an example image on this page:
http://dgrin.smugmug.com/gallery/3762805

The more commonly seen sunny 16 charts cover up to a 10 stop range down to bright interior light. I can't find the extended one that I have seen in the past that goes down to at least indoor candlelight levels. But this page shows a nice chart of EV values ranging from 2 stops brighter that "sunny 16" all the way down to starlight illumination (a 25 stop range):
http://www.advancedphotography.net/figure-light-levels-exposure-chart/-Linda
Subject: Re: Questions for potential converter to MF
Date: 2011-08-06 07:54:07
From: Linda Nygren
This link should work better:

> But this page shows a nice chart of EV values ranging from 2 stops brighter that "sunny 16" all the way down to starlight
> illumination (a 25 stop range):
http://www.advancedphotography.net/figure-light-levels-exposure-chart/
Subject: Re: Questions for potential converter to MF
Date: 2011-08-06 09:43:51
From: Bob Venezia
Actually I was referring to John Hart's dupes throughout. Those are
the first I've seen that don't look to me like dupes. They were as
impressive, to me, as original MF slides. The subject matter certainly
didn't hurt. As John T points out, these were originally captured
digitally and maybe this did help. I suppose it would have a lot to do
with the quality of the sensor.

And I've yet to spring for a drum scan of a pair of slides. I do have
an Imacon scan waiting for me at a local service agency. I gave them
one half of a pair and scanned the other at home on my flatbed. I
wanted to see how mine holds up to the Imacon.

I could tell (or so I thought) that John T's gallery display was all
original slides.

The dupes made by Boris were also captured digitally but those end up
looking like the dupes I expect. Yoshi also had nice dupes. It would
be interesting to compare those to his originals.

Maybe we could arrange the equivalent of a Medium Format wine tasting.
I'll host! :^)

Bob Venezia
Seattle, Washington


On Aug 6, 2011, at 12:56 AM, John Thurston wrote:

> Bob Venezia wrote:
> - snip -
> > The very best MF dupes I have seen were John Hart's dupes of his
> > fractals and colored water droplets shown at the gallery in Loveland
> > last month. That was the first I'd seen an MF dupe that impressed
> me.
>
> These, I think, are superior to other "dupes" we have seen
> because they are actually first-generation "dupes". When John
> creates his digital files, he knows everything in his image
> and can control the color and contrast in the image. If he
> creates his images in the sRGB space (which Gamma Tech's film
> recorders use), then he knows the colors will be available.
>
> > John, perhaps out of modesty, did not mention his own slides. I
> > believe they were done by Gammatech. And maybe John could weigh in
> on
> > how he achieved such a stunning result. Sharp and vibrant.
>
> If you refer to my gallery display, the results were
> relatively easy to achieve.... I displayed originals and
> hoped like hell that no one spilled drinks on them.
>
> If you refer to my small box of dupes (I had three at the
> convention along with their originals), I actually carry
> those around as examples of disappointment. After investing
> weeks of work (and a several hundred dollars in software and
> production costs), I had one dupe'd slide I wouldn't be
> ashamed to submit to a folio. The others are interesting to
> trot out as a parlor trick, but like a three dollar bill,
> would never pass for real.
Subject: Dupes (Re: [MF3D-group] Re: Questions for potential converter to MF)
Date: 2011-08-06 11:15:19
From: George Themelis
> Actually I was referring to John Hart's dupes throughout. Those are
> the first I've seen that don't look to me like dupes. They were as
> impressive, to me, as original MF slides.

What exactly is a "dupe"? For me, it is an image captured on film and then
duplicated on film again. This duplication can be done photographically or
digitally. The duplicate picture is normally not as sharp or of the same
quality as the original and one can tell the original from a dupe.

If an image is captured digitally and then transferred on film (as John
Hart's pictures) I would not call this a "dupe". It is missing the very
critical step of the duplication, the first step, either scanning or
photographing the original to create the "internegative" or digital copy and
it is this step that contributes mostly to the loss of quality.

That being said, the digital images that I have transferred to film do look
like "dupes" but this might be the fault of the quality of the digital image
(from my W3 or other compact digital cameras).

George
Subject: Re: Dupes (Re: [MF3D-group] Re: Questions for potential converter to
Date: 2011-08-06 11:27:54
From: Bob Venezia
Good point, George. Maybe I'm using the term incorrectly. In each case
a film recorder made the final image. I think for me the real issue is
what is the best we can expect from a film recorder? I think I saw
that in John Hart's slides. A good MF original slide has always been
the gold standard for me, and John H's slides were on par.

I also believe that a good scan of an MF slide is going to be superior
to an original out of the W3. Just my belief. I'm sure there are major
religions based on less. :^)

Bob

On Aug 6, 2011, at 10:14 AM, George Themelis wrote:
> What exactly is a "dupe"? For me, it is an image captured on film
> and then
> duplicated on film again. This duplication can be done
> photographically or
> digitally. The duplicate picture is normally not as sharp or of the
> same
> quality as the original and one can tell the original from a dupe.
>
> If an image is captured digitally and then transferred on film (as
> John
> Hart's pictures) I would not call this a "dupe". It is missing the
> very
> critical step of the duplication, the first step, either scanning or
> photographing the original to create the "internegative" or digital
> copy and
> it is this step that contributes mostly to the loss of quality.
>
> That being said, the digital images that I have transferred to film
> do look
> like "dupes" but this might be the fault of the quality of the
> digital image
> (from my W3 or other compact digital cameras).
>
> George
>
Subject: Re: Dupes
Date: 2011-08-06 11:30:19
From: George Themelis
OK, it is more a matter of terminology but I think a "photographic
duplicate" refers to creating a copy of an original in the *same* format.
For example, start from a slide and end up in a slide. A print to print
(without using the original negative) negative to negative, a digital image
to digital image (zero loss)!

If you use film (say negative) to make prints, this is not duplication. If
you use digital images to make prints or negatives, or slides, this is not
duplication.

George
Subject: Re: Dupes (Re: [MF3D-group] Re: Questions for potential converter to
Date: 2011-08-06 11:36:30
From: George Themelis
> I think for me the real issue is
> what is the best we can expect from a film recorder? I think I saw
> that in John Hart's slides. A good MF original slide has always been
> the gold standard for me, and John H's slides were on par.

As others pointed out, the subject is very important too. John Hart's
slides were computer-generated digital images. Hard to compare them with
originals because cameras do not produce computer-generated images :)

A better comparison would be to take 3d pictures of ordinary subjects
(people, scenics), transfer them to slide film and then compare them to
similar pictures taken with a 3d camera. Whenever you transfer an image
from one medium to another, a little something is being lost, I would think.

George
Subject: duping process, bottlenecks, and more
Date: 2011-08-06 12:46:34
From: Bill G
> Whenever you transfer an image from one medium to another, a little something is
being lost, I would think.



Yup, in general, this is true, however, there is many
techniques that have overcome the duping and enlarging shortcomings. Specially with
digital tools available to us now....

but in analog, if you ever visit Manglesons galleries, you can see 35mm captures images
printed 40" wide.... nearly a 30x enlargement. If you tried this with a traditional
enlarger, the final image is not so great.... as contrast and grain are exploited and
become the proverbial "weak link in the chain"....


He developed a technique where he used contrast masks and via an enlarger and jumped to a
4x5 inter negative, which became the new "original" film for printing. The final 40"
prints were excellent (I have seen better of course, but NOT from 35mm capture).... so
was there resolution added? if you compare it what a print would look like direct
printed from 35mm, then you would swear that resolution was added.... but, this is a
result of less grain and higher contrast, which are very powerful resolution cues.
Contrast itself really is resolution, as even edge sharpness of lines can be expressed as
loss of contrast at the edge. The entire premise of resolution is expressed in MTF,
which represents the ability to transfer contrast from one point to another.


Anyway, this does not relate to MF to MF duping, but it demonstrates how even in
yesteryear, there was complex techniques that greatly improved the output and defied the
eyes. With MF to MF... well, it comes down to.... what are you willing to pay, and what
are you starting with? I have run many experiments in this area, some using $600k film
recorders.... here is my general assessment....


First off, the quality of the original is a significant issue.... (whether digital or
film, here I discuss film only)


if you start with HIGH quality original, such as Velvia, shot with best lenses and
relative wide apt., say f8 (DOF was sufficient to accommodate the shot). The subject
matter had contrast that worked within the films sweet spot, and the resolution of the
subject also did not exceed the films MTF curves, well, duping this shot is hard to re
create.... under a best case scenario, with all the right equipment, you might be able to
make an identical dupe. but through traditional methods, such as standard contact
duping, scanning / film recorder, it will be difficult to reproduce the original. Oh
yeah, one of the big problem is.... the film you dupe to, will not hold as much resolution
as Velvia, so that alone is a weak link in the chain, unless you dupe to Velvia with
appropriate equipment...


OTOH, if you start with a mediocre shot, maybe at f22 (highly diffraction limited) and low
resolving film, low contrast subject with low resolution threshold at the film plane vs.
the films MTF curve.....well, now, with money and time, you can make an improved dupe vs.
the original, via digital tools and many different printing methods.... as now, the
bottleneck was in the original, not in the duping steps...


Then, you have the ultimate limiting factor, how will you view the final film? If the
design exit pupil of the optics you are view is too small, say 2mm, then the bottleneck
lies in the viewing optics, and it this shortcoming will be the bottleneck, not the duping
process or the original....so this is a major factor often overlooked. We all know how
apt. diam. limits lens aerial resolution via apt. diffraction. All astronmers are aware
of apt. diffraction, it rules the entire premise of viewing distant objects. Well,
viewing optics also limit the resolution that can reach the retinal based on its effective
apt., which is not so obvious like a camera lens, as you need the lens design drawings to
know for sure, or spend some $ on some laser testing. Then, the human eye is a big
variable, as many aging eyes could never detect the difference between certain dupes,
while younger eyes will see the difference as DRASTIC. Light behind the film is also a
major factor in what your eyes can discern in differences, as bright light will drive the
eye pupils down to its sweet spot, making your vision ultra sensitive to small differences
in resolution. But with low back lighting, your wide pupil produces very inferior retinal
images, so once again, differences can go undetected.


I could write volumes on this, its a complex subject, but hopefully this will give you an
idea of the wide range of possibilities, and most importantly, understanding there is lots
of links in the optical train, not just duping.... as with all things, it comes down to
defining the objective, and determine if achieving such is worth the time and money....
big problem is today, the world is moving away from film, and film technologies. Its
too bad, cause film has never looked better. The best dupes will always have the most
significant set up costs....which is OK if you are making a few thousand dupes, but if you
making 5, well, you can end up with $200 dupe cost per view...

Bill








>
Subject: Dupes (Re: [MF3D-group] Re: Questions for potential converter to MF)
Date: 2011-08-06 13:11:11
From: John
--- In MF3D-group@yahoogroups.com, "George Themelis" wrote:
> John Hart's slides were computer-generated digital images.

Actually some (liquid drop collisions, 3D microscopy) were digital captures (not CGI like the fractals). I thought the gammatech film-recorder MF output was pretty good (e.g. good enuf to show at NSA), but not to compare with original MF transparencies. OTOH, MF film cameras would not be well suited to either of these apps. Difficult in the former, essentially impossible in the latter.

John
Subject: Re: Questions for potential converter to MF
Date: 2011-08-08 12:28:45
From: Brian Reynolds
Linda Nygren wrote:
> ----- "Bob Venezia" <bob@chairboy.com> wrote:
> > I'm going to weigh in on several things stated in this post.
> >
> > Dan Vint mentioned sunny 16 and moony 11. I'm good with sunny 16. But
> > moony 11? Maybe I'm missing something here.
>

> Moony 11 is not a phrase I have previously hear of, but it is
> apparently referring to photos _of_ the full moon, not photos of the
> earth illuminated by moonlight. Since the moon is actually in
> sunlight, it is really part of the sunny 16 rule. Some recommend f16
> for fully zoomed in clear sky full moon shots rather than f11. Not
> something one would be likely to do with MF stereo. 8-) But there is
> an example image on this page:
> http://dgrin.smugmug.com/gallery/3762805

I've usually heard it called the "Looney 11" rule. People expect to
see a bright Moon against a dark background, so this guideline lets
them overexpose the Moon, and get the high contrast they expect. The
actual surface of the Moon is fairly dark.

--
Brian Reynolds | "It's just like flying a spaceship.
reynolds@panix.com | You push some buttons and see
http://www.panix.com/~reynolds/ | what happens." -- Zapp Brannigan
NAR# 54438 |