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Subject: How wide can you go?
Date: 2011-07-24 17:15:40
From: coronet3d

I probably already asked this question before, but is it possible to expand the opening on the MF mounts to view 6x7 sized images (or close to it) and still be able to fuse the images. Has anyone tried it?
Thank,
Steve

Subject: Re: How wide can you go?
Date: 2011-07-24 17:27:18
From: narjan@pipeline.com

I've shot 6x7 with a pair of Mamiya press cameras
and "widened" (with x-acto knife)Spicer mounts so as not to waste
film "real estate". I widened symetrically, your viewer is the real
limiting factor.

Best Wishes,
John Billingham

-----Original Message-----

>From: coronet3d <coronet3d@yahoo.com>
>Sent: Jul 24, 2011 7:15 PM
>To: MF3D-group@yahoogroups.com
>Subject: [MF3D-group] How wide can you go?
>
>I probably already asked this question before, but is it possible to expand the opening on the MF mounts to view 6x7 sized images (or close to it) and still be able to fuse the images. Has anyone tried it?
>Thank,
>Steve
>
>
>
>------------------------------------
>
>Yahoo! Groups Links
>
>
>

Subject: Re: How wide can you go?
Date: 2011-07-24 18:20:04
From: JR

I have used pairs of Wess mounts, each 6x9, paired for stereo, (originals shot with the 6x9 roll back on a pair of Optika IIa cameras), but again it depends on how you are going to view them. I was mainly using them separately in a pair of 3-1/4 x 4 lantern slide projectors onto a silver screen with linear polarizers.

Regarding the Xacto, they have special blades and holders with jigs for making straight-line cuts. They are made for cutting matte board for framing pictures, but they work quite well for opening up MF slide mounts as well.

If you need to do a lot of them, a straight cutter in a router, using a wood template that you make to the exact size, can speed things up quite a bit.

JR

On Sun, Jul 24, 2011 at 4:27 PM, <narjan@pipeline.com> wrote:

I've shot 6x7 with a pair of Mamiya press cameras
and "widened" (with x-acto knife)Spicer mounts so as not to waste
film "real estate". I widened symetrically, your viewer is the real
limiting factor.

Best Wishes,
John Billingham

-----Original Message-----
>From: coronet3d <coronet3d@yahoo.com>
>Sent: Jul 24, 2011 7:15 PM
>To: MF3D-group@yahoogroups.com
>Subject: [MF3D-group] How wide can you go?
>
>I probably already asked this question before, but is it possible to expand the opening on the MF mounts to view 6x7 sized images (or close to it) and still be able to fuse the images. Has anyone tried it?
>Thank,
>Steve
>
>
>
>------------------------------------
>
>Yahoo! Groups Links
>
>
>

--
stereoscope3d@gmail.com

Subject: Re: How wide can you go?
Date: 2011-07-25 11:14:11
From: John Thurston

coronet3d wrote:

> I probably already asked this question before, but is it
> possible to expand the opening on the MF mounts to view
> 6x7 sized images (or close to it) and still be able to
> fuse the images. Has anyone tried it?

This is dependent on the viewer you use and the mount you
use. Simple viewers and side-by-side mounts can't go much
wider than we have now.

If you start with an 80x132 mount, it isn't possible to fit
anything wider than 132/2 (66mm) in there. If you want a
single mm border around everything, you're going to max out
at 63mm and the mount will probably fall apart in your hands
before you can use it.

If you start with an 80x140 mount, you can cram 140/2-3
(67mm) if you want a 1mm border left.

But your eyes and the viewer lenses have to be spaced wider
than that to view the image (unless you can diverge your
eyes). In practice, the aperture width isn't the problem. A
direct-view viewer just can't handle apertures spaced much
more than 62mm apart. If the apertures can't be farther than
62mm apart, then they can't be wider than 62mm (or 59.5mm if
you want to leave a little border between them).

The current crop of 3D World mounts have 54mm apertures. You
could possibly open these by two more mm on each side (making
58mm), but that's going to be about all you can get.
________________________________________
John Thurston
Juneau, Alaska
http://stereo.thurstons.us

Subject: Re: How wide can you go?
Date: 2011-07-25 11:21:25
From: JR

It is sometimes possible to slightly widen the divergence angle of a viewer by either offsetting the mount of the lenses, or by adding a weak wedge prism to the inside (the side of the lenses that face the slide) or both.

JR

On Mon, Jul 25, 2011 at 10:14 AM, John Thurston <juneau3d@thurstons.us> wrote:

coronet3d wrote:
> I probably already asked this question before, but is it
> possible to expand the opening on the MF mounts to view
> 6x7 sized images (or close to it) and still be able to
> fuse the images. Has anyone tried it?

This is dependent on the viewer you use and the mount you
use. Simple viewers and side-by-side mounts can't go much
wider than we have now.

If you start with an 80x132 mount, it isn't possible to fit
anything wider than 132/2 (66mm) in there. If you want a
single mm border around everything, you're going to max out
at 63mm and the mount will probably fall apart in your hands
before you can use it.

If you start with an 80x140 mount, you can cram 140/2-3
(67mm) if you want a 1mm border left.

But your eyes and the viewer lenses have to be spaced wider
than that to view the image (unless you can diverge your
eyes). In practice, the aperture width isn't the problem. A
direct-view viewer just can't handle apertures spaced much
more than 62mm apart. If the apertures can't be farther than
62mm apart, then they can't be wider than 62mm (or 59.5mm if
you want to leave a little border between them).

The current crop of 3D World mounts have 54mm apertures. You
could possibly open these by two more mm on each side (making
58mm), but that's going to be about all you can get.
________________________________________
John Thurston
Juneau, Alaska
http://stereo.thurstons.us

--
stereoscope3d@gmail.com

Subject: Re: How wide can you go?
Date: 2011-07-25 21:38:38
From: Chuck Holzner

You didn't say what camera you are using. If it is cha cha or twin cameras shoot portrait, (Long
direction up and down).

I probably already asked this question before, but is it possible to expand the opening on the MF
mounts to view 6x7 sized images (or close to it) and still be able to fuse the images. Has anyone
tried it?
Thank,
Steve