I always hear the Opteka one is exactly the same but I've heard some complaints that the shutter release is soft compared to the Canon one.
and for the ebay link posted above, I have no idea if that is good or bad. but if youre paying like 95USD for that, I'd rather get an Opteka one and not risk S/H from China and getting something thats not widely known...
I thought the shutter release on the BG-ED3 was soft anyway
Opteka don't make a grip for the 20D/30D as far as I'm aware
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