F
former member
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Leo sent the Helios-103 to me to figure out a way to make it into LTM. And it had to be "cost effective", meaning using a focus mount that could be found for fairly cheap. Buying a Summarit to convert a Helios-103 is "not cost effective". So- the Focussing helicoid for the Collapsible lenses was the way to go. They can be found for under $50. It was a lot of work, and a real "Hack". The Helios is too big to fit into a J-3, such as I used for Raid's Luxon. Now, I'm trying to figure out a good way to mount a CZO 50/1.5 into LTM... The same Helicoid will work for it as well, but I've got a Summarit to play with. J-3 mount works for the pre-war and wartime CZJ 5cm F1.5's, but not the Opton lens.