Typepad Import Image

Like a cable release socket in a film era SLR, it accepts electronic switches that let you fire your DSLR without pressing the shutter release.

Where it is: Usually found on the left-hand grip, the terminal is often hidden behind a protective rubber flap.

How it works: On many cameras, when a wired remote is plugged into it, a partial press of the remote’s release button activates AF, and a full press fires the shutter.

How to use it: By tripping the shutter without having to physically touch the camera, you’re often rewarded with sharper pictures. The Sony Alpha 550’s remote terminal shown here also allows you to lock the shutter open for time exposures using Sony’s RM-S1AM or RM-L1AM switch.