Many of these adapters are difficult to fit onto the a7ii and a7s as these newer models have new metal brackets instead of the old plastic brackets of the a7 and a7r. I originally bought the Fotasy adapter and you couldn't turn it on to block. I even tried to archive this adapter in different ways. This Neewer adapter (FOTGA brand) that I received was repaired with no problems and was cheaper. I've read that others have had problems with this adapter on a7s, so maybe every brand has a few bad balls.?
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