Archived posting to the Leica Users Group, 2013/01/06

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Subject: [Leica] IMG: Pt.Lobos Formations
From: rgacpa at gmail.com (Robert Adler)
Date: Sun, 6 Jan 2013 15:35:56 -0800
References: <CAAsXt4Ou+dC10_6A2vVH0BcG0SKEgCTNL+3wU5K7X6sirhsi6g@mail.gmail.com> <CD0F3685.3090%mark@rabinergroup.com> <CAAsXt4OgVth5zZmwX2o+2jWODs4TTjy2ySmT2yU_M26rCUQ07A@mail.gmail.com> <045f01cdec5f$d2c1fff0$7845ffd0$@verizon.net> <CAF8hL-GTQ_CqEe6t2s9_UvFcPiuhkzWPFynOuspXP-h0M=i+hQ@mail.gmail.com>

Correct, but it comes with shims loaded for the "average" calibration...

On Sun, Jan 6, 2013 at 2:54 PM, Richard Man <richard at 
richardmanphoto.com>wrote:

> Pretty simple: add or remove shims, focus on infinity, download image and
> examine at 100%, lather rinse and repeat. So you start with "thick" shims,
> and adjust to using thinner ones toward the end...
>
>
> On Sun, Jan 6, 2013 at 2:47 PM, Frank Filippone <red735i at verizon.net>
> wrote:
>
> > That is fascinating.....!
> >
> > I always suspected it was not as easy as taking out of the box and
> > shooting.......
> >
> > So how did you get the shims?  And did you do the "calibration" yourself?
> >
> > Frank Filippone
> > Red735i at verizon.net
> >
> > I found the GG not to be reliable on these technical cameras with medium
> > format backs. I had been using the ground glass, which, though it looked
> > sharp, often was not. These sensor are so remarkably flat that even being
> > off 1/100mm will cause out of focus images. That's why Alpa allows users
> to
> > shim the piece that holds the digital back onto their cameras to be
> > adjusted
> > with shims by 1/100mm. Other digital technical cameras allow you to
> adjust
> > the focus point of each lens to the back. The manufacturing tolerance of
> > the
> > back's mounting plates are not within this range.
> >
> > The difference between my traded in back and this back was .1mm (the back
> > had to be positioned .1mm closer).
> >
> >
> >
> > _______________________________________________
> > Leica Users Group.
> > See http://leica-users.org/mailman/listinfo/lug for more information
> >
>
>
>
> --
> // richard <http://www.richardmanphoto.com>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>



-- 
Bob Adler


In reply to: Message from rgacpa at gmail.com (Robert Adler) ([Leica] IMG: Pt.Lobos Formations)
Message from mark at rabinergroup.com (Mark Rabiner) ([Leica] IMG: Pt.Lobos Formations)
Message from rgacpa at gmail.com (Robert Adler) ([Leica] IMG: Pt.Lobos Formations)
Message from red735i at verizon.net (Frank Filippone) ([Leica] IMG: Pt.Lobos Formations)
Message from richard at richardmanphoto.com (Richard Man) ([Leica] IMG: Pt.Lobos Formations)