I think it depends on what model camera you have. I use the Canon RC-1 wireless infrared remote for my XSI and it works well enough for my needs. Though with the infrared remote the receiver is on the front of the camera body next to the grip so you have to point the remote towards the front of the camera. Also, I'm not sure if this remote works with the 40/50D line of cameras.
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Canon EOS Digital Rebel XSi | Tamron SP AF 17-50mm f/2.8 XR Di-II LD IF | Canon EF 50mm f/1.8 II | Canon EF 85mm f/1.8 USM | Sigma 70-300mm f/4-5.6 DG Macro | Sigma EF 530 DG Super | Think Tank Photo StreetWalker | Flickr
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