For my Sony A7S I bought because of smaller batteries in the battery grip to. I want to make a long time-lapse sequences, it seemed necessary. A short time later I discovered the 2EM and wondered where are the differences. Thank God I was right, for the 7s I need the 1EM. The support of the assignable switches C2 and C3 in the 2EM is intended for the latest A7 Mark II. The function handle does its job well. First, the camera is better in my hand. Everything else is well tested as in the earlier steps.