Hi,
A7 has electronic first curtain but A7r has not. The A7r probably is using the same chip as the D800/D800, while the A7 shares technology with the Alpha 99.
As pointed out by a knowledgeable person, the second curtain will also cause shake. The great advantage of the electronic shutter is that they don't need to close and than open the first curtain. Obviously good thing to have.
Best regards
Erik
I wonder if there are any shutter bounce issues? Is there no timer delay/electronic shutter thing?