Conceptus Remote Switches makes the best available mouth-triggered shutter controls for cameras. They make them primarily for parachutists, however I used one on my Olympus E-330 last year. Conceptus just announced that they now offer both the Bite and Tongue switches directly compatible with the higher end Canon EOS “D” series of cameras.
If anyone with a finger disability is looking to get into photography or improve their current techniques, I'd encourage you to bite into one of their triggers, and look at the D series from Canon because it's compatible.
If you take a look at my Olympus entry, you'll see how messy it gets when things aren't compatible. Now days I'm a Nikon shooter, so I'm holding out that Dick, who lives up the street from me will go Nikon next.
Here's the catch. You don't get too far into photography before you figure out how valuable a tool it is to be able to press the shutter button 1/2 way and focus the lens. Holding it allows you to maintain the focal depth and recenter the shot before you fully compress and snap the shot. This switch wont do this. Keep in mind, the target market a a guy free falling with a camera mounted to his helmet.
So not only do I need a Nikon model, I need Concepts to see all of us who dont have a right finger as a potential new market and design a dual channel model. I've got the design(s), I'm just waiting for my phone to ring.
The switches sell for less than $100 on many parachuting web sites. If you cant find one drop me a note.
Canon Compatible Models:
EOS 1D, 5D, 10D, 20D, 30D, 60D,
1D Mark II, D2000, 1V, 1VHS, EOS 3
www.conceptusinc.com