Photography question of the day...
Out of context: Reply #42
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- bigtrick0
any hot shoe flash will work off-camera. either you can get a flash cord for short distances and you hold any* hotshoe flash where you want it:
http://www.bhphotovideo.com/c/pr…
http://www.bhphotovideo.com/bnh/…or you get one of these optical slaves:
http://www.bhphotovideo.com/c/pr…
and you fit any hotshoe flash you want into it, and it will fire when it sees another flash (e.g. the popup flash on your 20d, or any* hotshoe flash on your 20d).
Any* hotshoe flash will work in your hotshoe, no adapter needed. A Canon-branded flash (or a flash specifically designed to work with Canons) will give you goodies like e-ttl metering, and automatic zooming, and such, but off-brand flashes will certainly fire just fine, although you'll have to things like metering and zooming manually.
*if you are hooking up a hotshoe flash to your camera directly or via a cord, beware that some flashes can overload the hotshoe mount because of a too-high trigger voltage. The interwebs say that this voltage is 250V for your 20d. Here is a list of flashes and their trigger voltages:
http://www.botzilla.com/photo/st…