“Astrophotography - Bulb setting and mirror lock-up? I do some astrophotography by mounting my camera to a port on the back of my Meade telescope. My current Canon xSi has a couple features that make this setup work: 1) A BULB shutter setting 2) The ability to lock the mirror up before taking the exposure. The Specs for this camera don't mention either of these. Question: Does the EOS 70D provide both of these function?”