Re: [Largeformat] WHAT IS IT?

[Clive Warren <cocam@cableinet.co.uk>]

From: Clive Warren <cocam@cableinet.co.uk>

>From: Pete Groh <pjgroh@cros.net>
>
>
>Hi:
>
>Told a friend I'd try and get some info on this "critter" he
>found on EBay.
>
>Hope someone can help me out. Thanks in advice.
>
>Pete/Ohio
>
>Here's the description:
>Wollensak-Dumont Oscillo-Amaton 75 mm f/1.9 lens in EXC.- condition.  There
>are some light cleaning marks on the fron element, should not affect the
>image.  Lens is mounted in Alpax shutter.  Shutter speeds are: T, B,1sec to
>1/100 sec.  Apeture 1.9-16.  Front element is 50 mm in diameter, Shutter
>approx. 62 mm in diameter (outside diameter).  Slow speeds very slow,
>shutter needs cleaning. There is threaded collar on the back of
>shutter(black).  You can make a retaining flange out of it.  Interesting
>wide angle lens to play with.  NO RESERVE

Pete,

Have played around with one of these lenses.  They are intended for
oscilloscope photography with a special film back attachment, probably
35mm. The focal length seems at first to rather interesting, however the
focal plane is extremely close to the lens.  The lens would require at the
very least a deeply recessed lens board and even then may not allow
focussing on the film plane of your common or garden 4x5.

As for coverage, it would probably struggle to illuminate the edges of a
6x9 format even when fully stopped down.

If it is cheap then it may be fun to play around with but remember that it
will be optimised for 1:1 and will probably not perform well at inifity.


All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment, Infrared FAQ
                            http://clive.bel-epa.com
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