@conropl Thanks, I plan to stabilize the camera body and lens. Everything is a rigid assembly so I can smother everything with beanbags once I'm set and ready to go. Nothing like added mass to damp oscillations.

I've been playing today and have had a modicum of success so far just hacking a few things I've got on-hand (and wow the 85 has some sharp IQ even at f/1.2). I'm shooting in live view as that's the way I have to focus. However, I can clearly hear the mirror slap. I'll pull the lens and verify that the mirror is, in fact, moving up and down. Obviously the shutter must still fire but that's not a lot of vibration - though it would be a simple matter to make an external shutter. However, I don't think I can hack my T2i to still expose when the shutter is disabled and open.