ZhanMing12 Offline Upload & Sell: Off
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freaklikeme wrote:
If the lens is designed with an FLE, then using the adapter for full-time focus would cause some performance degradation over using the lens' helicoid, yes. You could minimize that to a degree by getting the lens most of the way there manually and then using AF for fine focus control. Otherwise, the difference will be as impactful to lens performance as an extension tube.
There are quite a few lenses (m-mount and otherwise) that don't use an FLE, so the entire optical assembly moves as one unit. Those shouldn't be impacted, assuming the adapter is not flawed.
I tested mine extensively with a modified A7rII and a few known high-performance FLEs (50 APO cron, 35 lux FLE, 75 cron). None of the lens gives any resolution trouble at what I would call portrait distance. The 75 cron does soften by a tiny bit at 0.7m, but that clears up once I shift the lens from infinity. Things really deteriorate wide open at macro distances, though. You can still get close to 1:1 with a wider lens and the adapter, which is pretty cool.
No Leica lenses except the WATE and MATE are internal focus which IMO is more problematic.
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