[MF3D.FORUM:171] Re: Welcome new MF3D'ers

["Stuart Johnson" <gcsphoto@xxxxxxxxxxxxx>]

Hello Everyone,

        I'm not exactly sure where this is ending up, but I'll take this
moment to respond to Dave's question about his two different cameras with
the same focul length lenses allowing for matching images....

Well, as I understand it, there are variances between identical lenses for
the SAME style camera, so the likelyhood that there would be noticeable
differences between the two different BRANDS of 75mm lenses is
a real possibility.  Also, the distances may vary somewhat between the
lenses and each camera body's film plane. This would result in possible
different scaled images.  It seems that All of this together could be either
insignificant or quite noticeable.  I would be willing to guess that two
identical brand models would be the way to go for the twin images.

    I have been shooting with twin OM4 Olympus cameras for a few years and
have decided to improve on the
image quality by moving into the MF world.  I am currently assembling two
500 ELM Hasselblads to shoot
simultaneously (The 500 ELM is a 6x6 camera with a built in motor drive in
the base) on a Bogen twin camera
bracket modified to put the cameras literally side by side (the 500 ELM
Hasselblads allow this as I don't have to worry about the film manual winder
mechanism allowing for the lenses to be closer together than any of the
other MF brands I've looked at)  -Also, hoping that the quality of these
cameras and Zeiss lenses will provide clear, trouble free images.

    I have also been closely following the LLL conversation with the
mounting of stereo images and have benefitted from this!  -I had not really
fully understood the importance of "Less in the Left side of the Left Image"
as a rule until review of several 100 year old Books and Ferwerda's book
(Ouch! That book cost me $400 to get at a book fining shop!)...  However, I
am digging through old stereo pairs and mounting the duplicates with very
fine results after adhering to the LLL rule.  I had previously erroneously
assumed that there should be MORE in the left side of the left image then
the left side of the RIGHT image...  What a difference!
HOWEVER.... I DO have a question.... What is the correct AMOUNT to trim off
a left image to be ideal? Or, does it really matter?

        Glad to be of everyones aquaintance....  -Stuart Johnson
GCSPHOTO@xxxxxxxxxxxxx

----- Original Message -----
From: David Williams <davewill0@xxxxxxxxx>
To: Medium Format 3D Photography <MF3D.Forum@xxxxxxxxxxxxx>
Sent: Thursday, February 24, 2000 7:23 PM
Subject: [MF3D.FORUM:168] Re: Welcome new MF3D'ers


> Welcome to the new list members!
>
> While I'm not brand new to the list, I am fairly recent.  I've been
> shooting medium format for years in my comercial work, but only recently
> tried it in 3d.  I use a Bronica ETRS and a Rolleiflex TLR.  So far I've
> only used the ETRS in 3d with a slide bar, but I've been wondering
> something.
>
> The ETRS is a 645 format while the Rollei is 6x6.  The "normal" lens for
> both is 75mm.  Since the 645 is basically just a cropped 6x6, would
> these two images be close enough for a twinned rig if I trim off the 6x6
> print?  Or is the 75mm different for each format?  Am I missing
> something?
>
> Anyway, I'm enjoying the list, even though I haven't done much MF3d.
>
> Dave Williams
> Kansas City, MO
>
>
>
>
>
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