21 apr 2007 kl. 12.02 skrev karl shah-jenner:
...
Yup.. all of the copy cameras I've come across have had lenses with
irises - the agfa repromaster I last stripped had a 150mm, a G-
Claron 210mm
and a 270mm (all Rodenstock ) - and again, all had irises.
...
One of the reasons copy cameras had irises was to control DOF for,
believe
it or not, quite a bit of photography of 3D objects was done under
these
things.
OK, I stand corrected. I wasn´t aware of that kind of use for these
cameras. I can surmise, however, that some historical documents may
be a bit crumpled, or bound into a book, and too fragile and valuable
to attempt flattening them. In such cases, stopping down would be
necessary.
Per Öfverbeck
http://ofverbeck.se
"In a world without walls or fences, who needs Windows or Gates"
