I have two lenses with adequate coverage to work with my 8x10 camera. Both are working well with the exception of one small problem. I cannot figure out what the filter thread size is. I thought I had it worked out for the one, and bought a nice, metal lens shade, but it does not fit. Now I am a little uncertain and do not want to spend anymore money on either lens until I have some better information.
The first lens is a very nice Calumet Caltar-S II 9.5 inch f5.6. It has a large front ring and I thought it was an 87mm, but that turned out to be incorrect. Can someone point me in the right direction on this one.
The second one is a much older lens, at least I believe so. It is an Ilex Paragon f6.3 12 inch Series S in an Acme #4 shutter. So far I like this lens quite well but, again, I have no idea what the filter thread is. I tried my 62mm adaptor, and that was too big. Then I tried the 58mm adaptor, but that was too small. I do not have anything with a 60mm thread to test with. I can pick up another adaptor with a 60mm thread (this will be my only lens with that filter size), but I hate to spend the money for something I have no other use for. Additionally, as it is an older lens, I wonder whether it may be different entirely from the 60mm size being sold today.
Just to clarify here, I do primarily use step up and step down adaptors for threaded filters, and have never bought any of the Cokin gel filters so far. I would like to avoid that if I can. I have nothing against the Cokin system, but to go that way means additional purchases I would rather avoid.
Thanks very much for any help you are able to provide.