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 Post subject: E-TTL and Manual
PostPosted: Sat Dec 12, 2009 12:31 pm 
A couple of days ago I bought a Canon 580 EX II and while experimenting with it I found something odd (at least it seems to me so :? ):
I took two photographs with the same Aperture setting, Shutter Speed, ISO and using the 580. The only difference is that in the first picture ETTL mode was used and on the second Manual Mode with flash output set at 1/128th. The second picture was more exposed than the first picture, I tried it again many times but the results are the same, I must be missing something but what? I would be very grateful if you could help me. :D
Here's an example:
Camera: EOS 400D
Lense : EF 50mm F/1,4
Thanks in advance, and greetings from Greece! :D

 Post subject:
PostPosted: Sat Dec 12, 2009 2:46 pm 
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Joined: Sun Feb 15, 2009 12:59 pm
Posts: 6010
Location: The Netherlands
The only thing I can think of is that the flash head was zoomed in the second shot (or zoomed out in the first shot)

I take pictures so quickly, my highschool was "Continuous High".

 Post subject:
PostPosted: Sun Dec 13, 2009 12:47 pm 
I forgot to mention it, but I've tested that too, and it is not what's causing it.
I've also found out that if I use flash exposure compensation in E-TTL mode, I can further decrease the exposure, but I cannot find a away to do it in Manual mode. :(

Edit: After some more testing in External Metering mode, in which I was able to use the flash at an output very lower than in Manual mode, I've reached this conclusion: Either that the flash is capable of firing at a lower output but there's a limit in M mode, or that I'm missing something. :?

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