Re: Tolerance

[Don Roberts <droberts@xxxxxxxxxxxxx>]

Yes, 46.mm is the right distance for flange to film and infinity focus.  The
previous poster pointed out the problem I think that matching the disk diameter
and the actual focal length is tricky and time consuming. Using a zoom lens
does help (I use a Tokina 20-35mm zoom) or you can follow the procedure in
Michael Dusarriez' book and build up or cut down the disk.  He gives some
diagnostics for which you should do.  Still a lot of trial and error though.
Good luck.

Robert Durn wrote:

> I have just taken some test shots with my new home made "Roboscope 2"
> camera! It uses 120 film stock and a 24mm Nikon lens. The image measures
> 152mm on the negative for a full 360 degree. Using the 2 x focal length x Pi
> rule it should be 150.796mm. Is this within tolerance? The images are
> sharp-ish but I'm not sure if the lens is mounted at the correct distance to
> the film. Should it be 46.5mm for Infinity?. Any thoughts?
>
> Rob Durn.
>
> Also at Robert.Durn@xxxxxxxxxxxxxxxxxxx

--
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  Don Roberts * Bittersweet Productions * Iowa City, IA
              *                         *
  It is better to know some of the questions than all of
  the answers.- Aldous Huxley
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