>>4056703The Helios 89 is an especially uncommon half-frame lens I bought modified to L39 mount. I looked after reading your post, and I doubt a matching adapter like the one you're talking about exists. If I adapt to EF/m-43, then I'll screw up the flange distance. I've tried that before with a similarly modified lens. Only thing I can think of now is trying to attach a microscope diaphragm to the front of the lens. Pic related. I'm not too worried about the vignetting because of the crop, but can anyone speculate on whether or not I'd get control over my depth of field?
