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Subject: Re: Digest Number 617
Date: 2008-10-19 12:07:25
From: Dr. Kevin Pernicano
I have held my tl120 overhead many times to get a higher perspective.  I used a waist level finder and a line level to make sure I was shooting without a tilt. This is an old trick I used to use with a 2d 120 TLR or the old NikonF with a waist level finder to get over a crowd.  The only problem is making sure you remember to reverse your film chips when mounting, since the camera is shooting upside down and "backwards" from its upright position!

Dr. Kevin Pernicano
Louisville, KY, USA (Home of the Kentucky Derby)

--- On Sun, 10/19/08, MF3D-group@yahoogroups.com wrote:
From: MF3D-group@yahoogroups.com
Subject: [MF3D-group] Digest Number 617
To: MF3D-group@yahoogroups.com
Date: Sunday, October 19, 2008, 11:32 AM

Medium Format Stereo Photography

Messages In This Digest (4 Messages)

1a.
Re: paired Flexaret vs. Sputnik From: coronet3d
2.
Barrel and Keystone distortion From: coronet3d
3a.
Hanging a TLR upside down From: coronet3d
3b.
Re: Hanging a TLR upside down From: Michael Davis

Messages

1a.

Re: paired Flexaret vs. Sputnik

Posted by: "coronet3d" coronet3d@yahoo.com   coronet3d

Sat Oct 18, 2008 5:06 pm (PDT)

> Matej Bohac wrote:
>I wonder whether the extra labour of searching for a matched pair of
>Flexarets, modifying the bodies to gain natural base, linking the
>controlos etc. - and carrying the extra weight of the two robust
>bodies during my backpacking trips(!) - was worth getting the optical
>quality and shutter reliability in comparison to a tuned Sputnik?

I agree with previous posters that it is very difficult to use a
twinned arrangement to obtain a "natural" base. There is a tremendous
difference between a Sputnik and two TLRs. The Sputnik is lighter
than most single TLRs out there.
Having said that though, the Flexarets look to be well suited to
twinning in that they have their focus knob/lever on the front of the
camera - at least in the examples I've seen. This should in my
opinion make them easier to operate when on a twin bar. I believe
that the eBay seller Cupog handles a fair amount of Flexarets - maybe
he could check the focal length out for you and supply a matched pair.
There are cases where a twinned arrangement is the only way you're
going to obtain depth in a scene. In my case it's around 1 in 10.
The unfortunate thing is that you have to blow two rolls of film in a
twinned arrangement yielding 12 images, while the Sputnik will yield
six images on a single roll. Most stereo photographers look to grab a
foreground object in order to add depth to an otherwise flat scene.
Again, in some cases even this method won't work.

Brian Reynolds wrote:
> When properly tuned and used within its capabilities
> a Sputnik can produce very nice stereo pairs.

My Sputnik worked great out of the box, but then it fell out of sync.
I sent it to Ted Baskin who re-calibrated it and added flocking.
Since then it's been a great performer for me.

Steve Sawyer

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Messages in this topic (4)
2.

Barrel and Keystone distortion

Posted by: "coronet3d" coronet3d@yahoo.com   coronet3d

Sat Oct 18, 2008 5:08 pm (PDT)

I'm looking for opinions on these two types of distortion that to my
eyes look somewhat similar. If both cameras are yielding the same
barrel distortion, will this foul up the 3d image? Same goes for
Keystone distortion - although Keystone problems are due to
composition and not to lens properties. Again, if both cameras
reflect the same Keystone distortion, will this foul up the stereo image?
Thanks,
Steve

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Messages in this topic (1)
3a.

Hanging a TLR upside down

Posted by: "coronet3d" coronet3d@yahoo.com   coronet3d

Sat Oct 18, 2008 5:10 pm (PDT)

Has anyone ever tried to hang their Sputnik or 3D World camera upside
down to obtain a higher perspective? If so how did you set up the
tripod to do this?
Thanks,
Steve

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Messages in this topic (2)
3b.

Re: Hanging a TLR upside down

Posted by: "Michael Davis" zilch0@globalcrossing.net   zilch0md

Sun Oct 19, 2008 6:44 am (PDT)


At 07:10 PM 10/18/2008, coronet3d wrote:

>Has anyone ever tried to hang their Sputnik or 3D World camera upside
>down to obtain a higher perspective? If so how did you set up the
>tripod to do this?

I hang the tripod upside down from a tree branch then stand on a ladder.

:-)

Mike Davis

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Messages in this topic (2)
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