JYC Shutter Release SR-S1 for SONY A77 A65 A57 A55 A33 A100 A200 A300 A350 A700 A900 Maxxum/Dynax/AF 7D 5D 9xi 7xi 5xi 100% compatible with SONY RM-S1AM , Minolta RC-1000s Shutter Release. The release button reacts fast and fine. Two stage release button: Halfway pressing for autofocus, complete pressing takes the picture. Lock the button for long exposures or continuous shooting.