Yes but only in manual or non TTL auto, and to be 100% sure there are no shorts between the small contact pins (although unlikely) a hotshoe adaptor that only has the center pin connected is recommended.
Sorry, I shoot with Nikon, no experience with either
These Canon models do not have Date Stamps. The point and shoots, mostly they do have it. Among DSLRs, Nikon's entry level cameras have it.
A recommended flash for the Canon T3i is the Canon 430EX II. This flash is about $270. However, honestly, any Canon flash will work well with the camera.
We can not say that, that depends on a lot of stuff. Do you already have lenses for Nikon or Canon? People have different meanings about that, do you know someone who has more knowledge about this question than you do? Ask that person, and ask him/her why he finds that. You can also Google it of course, for a lot of opinions. :-)
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A Canon Rebel t3i
He uses Canon
Yes.
Yes with an adapter
There are many essential accessories that one can have for their Canon Rebel T3i camera. A few accessories that one may need is a lenses, a case, and an extra battery.
It depends on the preference of the buyer.
no but the opteka 6.5 mm lens will