On Tuesday, December 10, 2002, at 01:12 AM, Steven Kefford wrote:
Transmission Range: Indoors: Approx. 12-15 meters/39.4 - 49.2 ft; Outdoors:Hm. Interesting that the Canon specs claim that the ST-E2 has this kind of range. It certainly doesn't seem that great. Canon's Chuck Westfall seems to confirm it in:
Approx. 8-10/ 26.2-32.8 ft
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=001OtS
where he says:
"The facts that the flash unit itself is relatively low-powered and masked by the near-IR filter are its biggest weaknesses. These factors combine to reduce the ST-E2's effective usable outdoor range to a maximum of 5m/16.4 feet in the center of the receptor's coverage angle, and 3.5m/11.5 feet at the edges."
and
(When the 550EX is) "set as a "master unit" for an E-TTL wireless flash configuration, its preflash is stronger than that of the ST-E2, and it is not hampered by the presence of a near-IR filter. This increases the effective usable outdoor range of the 550EX to 10m/32.8 ft at the center and 7m/23.2 feet at the edges, albeit at the expense of being discreet."
For the 550EX:Also, as I mentioned, you can flip down the wide-angle diffuser panel for increased coverage beyond 24mm if that's important. Though obviously, and as I forgot to point out, you'll get way less range if you do that.
Transmission angle: Horizontal: Approx. 80� / Vertical: Approx. 60� (At M 24
mm zoom setting) (Manual zooming of flash head also enabled)
- NK Guy
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