<span class="postbody"]Hello,


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.


Here's an example:







P.S.: The head zoom was not changed during these shots, <span class="postbody"]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. Same thing with External Metering Mode in which the flash exposure can be limited to a very subtle light.
<span class="postbody"]
Camera: EOS 400D


Lense : EF 50mm F/1,4


Thanks in advance, and greetings from Greece!