The measurement is 46mm, flange to film plane.
--- Bill and Pam <clar132@xxxxxxxxxxxxx> wrote:
> Hey all,
>
> I have been using my OM1(n) for
> astrophotography (as well as regular photography)
> for some time now. Any other astronomers out there?
> I now want to get a bit more picky with my exposure
> times. To do this, I need to know the distance from
> the film plane to where the lens rotates on (I
> forget what this part is called; lens flange?
> camera flange?). Does anyone out there have such a
> measurement? Maybe our friend John H.? I would try
> to do it myself, but I do not want to damage the
> shutter or anything (no tools to measure here). Any
> experts out there?
>
> Please respond to the list as I will be offline.
>
> Thanks in advance!!!
>
> -Bill Clark
>
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