Posted: Tue Jul 22, 2014 3:53 pm Post subject: |
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dan_ wrote:
I successfully grind the back of a Helios 44-2 much more then 1-2 mm and changed its mount to Leica R in order to use it with my Leica R Speed Booster, but not the back lens barrel - only the 42 mm. screw mount. I've used a lathe to do it and yes, I secured it with tape and round cut cardboard on glass on both the back and front glass. I taped the whole lens and fixed it to the lathe by the front filter ring with a special made piece. |