How do I add an extra hotshoe to my canon t2i/550d?

If that top bracket is the same diameter as the rails (15mm), then this should work http://www.bhphotovideo.com/c/product/85... then http://www.bhphotovideo.com/c/product/91... and add the mic and light. Tip: If you are planning on getting a dSLR primarily for video work, either don't do it, get 2 or more of the same camera or get a dSLR designed for video not one designed for still image capture that happens to get video as a convenience feature. They are easy to identify - pull the manual from the manufacturer's website.

If there are warnings about overheating or 29 minute 59 second duration limit or 4 gig segment limit, then you are looking at the wrong camera.

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