
I have tested the MK-A7R IV grip with Sony A7SIII and A1. That works fine. However, it's cheaply made and I'm concerned that the battery latch will eventually fail. It's a shame they couldn't make it a bit stronger because that's the only complaint I have about this grip. It's not as refined as the Sony model, but it's four times cheaper! In the Q&A section, someone replied that it doesn't work with the A7SIII. Not sure why. The Sony version of this grip works with the A7R IV, A7SIII and A1 so it should work the same and at least it worked for me.

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