"J Stafford" <john@stafford.net> wrote...

A picture shot with such lens onto a 70mm square film would have
enormous perspective distortions beyond the central 35mm square.
Why would anybody want that?  The diagonal coverage angle of that
lens has to be close to 140 degrees.  The light fall off on the
edges gotta be awful!...  The corresponding focal length of a 35mm
lens would be 8mm.  I know of a fish-eye lens like that, but you
say it isn't a fish-eye...  I cannot imagine such optical wonder.

Sorry, I know I am not really helpful in identifying the lens (if
it does indeed exist).  Just couldn't help but wonder.

Victor

Are you sure that shouldn't be 21cm?  21cm or 210mm is a very common LF
focal length. (plus, a medium tele is mostly used in aerial photography.)
can you scan the picture and put it on-line somewhere?

I have used the zeiss 24mm fisheye once, but this already gives a
circular image on 6x6.

Lourens