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Yes, there is this issue with some LR-NEX adapters, Metabones in particular. However, Novoflex adapters do not seem to exhibit this problem, and newer Fotodiox adapters appear to be all right as well. I've got all three, and the Metabones adapter is the only one that has the leak issue. The newer Fotodiox adapter, if you look from inside, seems to have exactly the same release mechanism as the Novoflex (there is a metal strip that seems to block the light that might leak from the release pin hole).
I'll probably replace the Metabones adapter with either Novoflex or Fotodiox, but in the meantime I just managed to stick a piece of black tape over the release tab and it doesn't leak anymore. It's annoying, but I actually like the extra weight of the Metabones adapter in conjunction with heavier lenses (more even weight spread), as compared to the lighter Novoflex and Fotodiox. Too bad...
Had some interesting experiences with my R lenses on the Sony A7 last weekend. I noticed that I was getting some really bad light leaks just taking normal shots. No long exposures or anything.
Realised that the light was getting in around the lens release mechanism between the adapter and the lens. The way the R lenses are designed, where you can see the locking tab right on the edge of the lens means that light gets in. I guess this is why the Elmarit 60 1:1 adapter has the big lip around the outside that covers the aperture ring...Show more →