I have 4 lenses for my Crown Graphic. I've been able to screw in a threaded adapter to my 135mm Schneider and 10" Tele-Raptor and use step-up rings to use the 58mm threads on my black & white filters and rubber shades. (My filters do triple duty using them on 35mm, medium format and 4x5).

My other 2 lenses are a 90mm Graflex Optar f6.8 and a Kodak Ektar 203mm f7.7 . These lenses have no threads, so a push-on adapter is necessary. Who, out there in Graflex-land knows the correct size for these two lenses. It would be great to be able to use filters and hoods on these also. (Camera shows don't have much in the way of "antique" gear).

Also, what are the correct sizes for front and rear caps for these lenses. They are bare at the moment.

Thanks for your help.

This is a fantastic forum. Great education.

My nifty 1948 version of Kodak Lenses says the Ektar lens takes a 1 5/16", 33mm, Series VI adapter. That was the prime Kodak lens for ther 2D and other 5x7 cameras.