Caltar does not manufacture lenses. It is the trade name for lenses sold by
Calumet, but manufactured by another entity under contract to Calumet. Do
you know if it is an Illex Caltar or a Rodenstock Caltar? I believe
Schneider also manufactured them for a brief time.
I have a 90 mm Illex Super Angulon clone from about the mid 1970s and I love
it. It is not the brightest lens, so focusing in dim light can be
problematic, but it is sharp and provides a good image. Alas, it is not
threaded for filters. So far as I know, it is indisguishable from the
Caltar (except, of course, for the fact that it says Illex on it).
>> Stay informed about: 90mm F8 Wide field Caltar?