Originally Posted by kb244
Problem with putting it into an M42 adapter is the registration distance is going to be quite a bit off (long) that you'll probably only be able to shoot super macros if anything at all.
What I'm using is not strictly an m42 adapter, but one made especially to mount m42 helicals, a short adapter. But still, it's a little long. Distant focus is about 10 feet or so. I need to find a millimeter here or there to make it work. What would be ideal is a c-mount helical for micro 4/3, but I haven't found one. That would also be quite nice for those c-mount lenses which don't have built-in focusing, like the 1 inch Wollensak I have.