Sounds like a great idea! I use a Canon ST-E2 wireless controller sometime just for the AF assist lights. it works great! at USD$200 it's a little steep just for an AF light! the Keyring will probably work ok. The true AF lights work by projecting a pattern for the camera to pick up contrast from, but any light will help!
Here are a few shots I took in a club recently: Matt Play 09-19-09 - Perfected Perspectives -- Photography by Andrew Rodgers
Andrew Rodgers
Perfected Perspectives -- Photography by Andrew Rodgers | Andrew Rodgers (acedrew) on Twitter
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Canon 50D 24mm, 50mm, 100-400mm, 28-135mm
Panasonic Lumix TZ-3 Yeah, I have optical image stabilization and a 10X lens, it also fits in my pocket.
http://perfectedperspectives.com Twitter
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