I leave the adapter on the lens full time. FWIW, I ran into a situation today with a Samyang 35 1.4 Mk II for Sony that I also have adapted with a second ETZ Pro II. I was shooting a formal portrait and wound up having to adjust Fine Tune to -3 on my Z7II to get proper eye focus (checked numerous times and it was confirmed to be off.) Later, after the session, I swapped the two Megadaps between 135 and 35 and learned that the fine tune is registered in the adapter (both adapters have the latest firmware). After clearing it out, I swapped it back and the focus was ok on both lenses at 0 fine tune. Now while I do not know what caused this irregularity I do recall back in my DSLR days that I would sometimes have to change fine tunes with certain lenses after they were dismounted and then remounted (mostly applied to Sigma Arts like the the 85 and 50 1.4's). I bring this up to say that I would suggest that it might be wise to dedicate an adapter to a particular lens. The mount differences will directly affect AF correction algorithms, but I do not have enough experience adapting Sony lenses to make any assertions here. This scenario I described involves 4 separate manufacturers so no surprise something might be slightly out of design tolerance. This circumstance was confirmation that fine tuning is a tool that sometimes may be needed.
Eggsalads comments is interesting though. These adapters get confused on lens identifications. One of the adapters says the lens is 135mm but is being shot at 35. I think changing lenses with the same adapter may lead to registration problems which is my take away.
The Megadaps appear to have a lot going on translating the manufacturers data and the lens/camera focus signals. Really impressive piece of gear to be quite honest. I love the fact that I can use these other solutions. Gives a lot more flexibility. Just have to know the limits.
On the 135, it really helps to use the limit switch for distance control. This ensures minimal hunting when moving in long rack conditions. I really like the 135. The weight on this lens is quite manageable and is not too front heavy. But there is no way I would be using a FTZII with a lens like this (it it was a Nikon F). One of the reasons I abandoned the 105 1.4. Too front heavy with the adapter.
One last point, I ran the Samyang 135 on the adapter it was ok. Eyer focus was amazing but it was slow to go full rack and woult hunt here and there. The Sony is significantly better for AF (no surprise).
Dec 13, 2025 at 06:35 PM
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