Archived posting to the Leica Users Group, 2001/02/11

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Subject: Re: [Leica] focus inaccuracies: my test results
From: "Tom Schofield" <tdschofield@email.msn.com>
Date: Sun, 11 Feb 2001 20:19:59 -0800
References: <NBBBIDNIGLFOKNLJCPLHMEEKFFAA.danh@selectsa.com> <3A869E87.D45530D5@sympatico.ca> <3A86FF70.E1893C4C@rabiner.cncoffice.com>

I don't think you can just use a yardstick.  It appears that the scale on
the diagonal shows the distance along the side parallel to the way the
camera is looking.  That's why they charge $295, but you could no doublt
make one cheaper if you felt so inclined.

Tom

> >
> > Edmund's Scientific sells a convenient target that does just this and is
> > calibrated in line pairs per mm. It's a bit on the expensive side
> > (compared to a newspaper), but if it would end this thread, it is
> > definitely worth it...
> >
> > http://www.edmundoptics.com/IOD/DisplayProduct.cfm?productid=1485
> >
> Would like to mount a yardstick on a triangular device of this design.
> Then stand 2 meters away and do a test.
> That would do what i mainly would need done, DOF test wise.
>
> Mark Rabiner

Replies: Reply from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] focus inaccuracies: my test results)
In reply to: Message from "Dan Honemann" <danh@selectsa.com> (RE: [Leica] focus inaccuracies: my test results)
Message from Bernard Cousineau <flatbroke@sympatico.ca> (Re: [Leica] focus inaccuracies: my test results)
Message from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] focus inaccuracies: my test results)