Hi. Does anyone happen to know the screw-on filter thread size for step-up rings, etc. for the 10mm & 25mm C-mount Switar lenses for use on a Bolex? The lens caps are the same size, thus the filter thread size would be the same. I have several step-up rings, which none of them fit and I cannot find these specs anywhere online. Any help would be greatly appreciated.
P.S. I've measured the threading myself (which most certainly could be wrong) and I've come up with the neighborhood of 32mm. However, I can't be sure until I actually get something to screw on. Thanks to all.
jw
