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 07/21/2004 06:20:45 PM · #1
Does anyone know where I can find all the features of the Canon Speedlite 550EX and the Sigma EF-500 DG Super? I'm looking into those two and I'd like to know exactly what I would get with each one. Thanks in advance.

June
 07/21/2004 08:29:11 PM · #2
Canon 550EX

//consumer.usa.canon.com/ir/controller?act=ModelTechSpecsAct&fcategoryid=141&modelid=7270

Sigma EF-500 DG Super

//sigmaphoto.com/html/flashes.htm
 07/21/2004 10:44:13 PM · #3
One of the things to remember about the Sigam EF-500 DG Super is that the focus assist beam (used when focusing in low-light situations) is only effective when using the center focusing point. The 550EX's focus assist beam works with all five of the Digital Rebel/10D's horizontal focusing points, and the 420EX with all seven.
 07/22/2004 04:06:50 AM · #4
Thank you for the info guys, I really appreciate it.

June
 07/30/2004 08:45:18 PM · #5
OK, so I read both descriptions and they seemed almost the same to me. Now, can someone what is the main difference between the two? The range is the same, which I thought was the difference.

June
 07/30/2004 09:53:22 PM · #6
The Canon 550EX has custom functions, it covers the 5 horizontal focus point of the Rebel's AF compared to Sigma's coverage of the center point only, it won't cancel FP mode after each shot like the Sigma does, and it has a high-voltage socket for fast cycling.

The Sigma can be used as a slave.

I looked at both of these flash units and decided having coverage of all 7 focus points was more important to me than the extra features offered by these units, and went with the Canon 420EX.
 07/30/2004 09:56:03 PM · #7
Originally posted by Dyslexic:
The Canon 550EX has custom functions, it covers the 5 horizontal focus point of the Rebel's AF compared to Sigma's coverage of the center point only, it won't cancel FP mode after each shot like the Sigma does, and it has a high-voltage socket for fast cycling.

The Sigma can be used as a slave.

I looked at both of these flash units and decided having coverage of all 7 focus points was more important to me than the extra features offered by these units, and went with the Canon 420EX.


I'm not quite sure what this means, but in the case of the Sigma, can you just compose and meter using the center AF point and then recompose and shoot?

June
 07/30/2004 10:06:27 PM · #8
Originally posted by chiqui74:


I'm not quite sure what this means, but in the case of the Sigma, can you just compose and meter using the center AF point and then recompose and shoot?

June


You can, but it may be very inconvenient with some shots. I wouldn't want to have to do that with a slow-sync night shot, for example. Or in action shots, you might miss the perfect moment.
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