My SLR Magic HyperPrime LM 50mm T0.95 Review!

Started Oct 12, 2012 | Discussions thread
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Re: My SLR Magic HyperPrime LM 50mm T0.95 Review!
In reply to BSweeney, Oct 14, 2012

One "final thought", if I were designing a lens this heavy: I would use a long-throw focus in order to have more turns in the helical to keep the optics module steady in the mount as it was focused. Some customers stated that close-focus was more of an issue, which occurs when the lens is extended the most and fewer turns of the helical making contact. Using a long-throw focus gives more area in the threads to maintain contact. I've seen slop in helicals that prevented good RF coupling across range, one German wartime Sonnar corrected by making a lining for the RF cam to keep steady against.

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