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Sigma vs. Canon flash for XTi
I am in the process of shopping for a flash module for my XTi. I have it narrowed down to about 3 choices: (1) Sigma Electronic Flash EF 530 DG Super (about $260 on amazon) http://www.sigmaphoto.com/flashes/flashes_flashes_details.asp?id=3263&navigator=1 (2) Canon Speedlite 430EX II (about $240 on amazon)… -
Re: Sigma vs. Canon flash for XTi
It depends a lot on the distance to subject and the focal length of your lens as well as the amount of ambient light. At ISO 100 your 430EXhas a guide number (GN) of 141 feet with a 105mm lens. It will act like it has a GN of 282 feet at ISO 400 and a GN of 564 feet at ISO 1600. With a 24mm lens the GN is 82 feet (or so)…
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