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Subject: Parallax accommodation for the TL120
Date: 2012-11-08 17:45:25
From: John Thurston
Has anyone rigged a viewfinder inverted-periscope for their
TL120?

The finder-lens is centered between the taking lenses, but
is obviously higher. This isn't usually a problem, but I'm
thinking about some images with subject distances of between
1 and 3 meters. At these distances, I suspect the framing is
going to be tricky.
--
John Thurston
Juneau Alaska
http://stereo.thurstons.us
Subject: Re: Parallax accommodation for the TL120
Date: 2012-11-08 19:39:10
From: David Richardson
 The way I've tried to deal with the problem I think you are speaking of, is to mark the central column of the tripod
 with a line marked for the difference between the viewing and taking lens. Being part of the old school idea of photo work, no photo of worth is taken without a tripod. Might not be spontaneous, but few spontaneous photos I've taken sell well.

From: John Thurston
To: MF3D-group@yahoogroups.com
Sent: Thursday, November 8, 2012 3:45 PM
Subject: [MF3D-group] Parallax accommodation for the TL120
 
Has anyone rigged a viewfinder inverted-periscope for their
TL120?

The finder-lens is centered between the taking lenses, but
is obviously higher. This isn't usually a problem, but I'm
thinking about some images with subject distances of between
1 and 3 meters. At these distances, I suspect the framing is
going to be tricky.
--
John Thurston
Juneau Alaska
http://stereo.thurstons.us/

Subject: Re: Parallax accommodation for the TL120
Date: 2012-11-08 23:40:37
From: Brian Reynolds
David Richardson wrote:
> From: John Thurston <juneau3d@thurstons.us>
>> Has anyone rigged a viewfinder inverted-periscope for their
>> TL120?
>
> The way I've tried to deal with the problem I think you are speaking
> of, is to mark the central column of the tripod.
>
> With a line marked for the difference between the viewing and
> taking lens.

Mamiya had a device for their TLRs based on this idea. It was called
the Paramender. It was a camera platform on a short column that
attached to a tripod via a second plate. The column was lowered for
composition, and focusing, and then raised to take the photo.

By mounting this to your tripod head it always moved the camera in the
correct direction. If you try this with the tripod's center column,
you limit yourself to compositions with the tripod head aligned with
the center column. If you tip the camera, the center column no longer
moves parallel to the vertical axis of the camera.

This blog post by Mike Connealy shows what I mean:

<http://connealy.blogspot.com/2012/07/playing-with-paramender.html>

--
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 |