Alex Zabrovsky [[EMAIL PROTECTED]] wrote on Tue, 11 Dec 2001 18:11:13 +0200
>First of all, I'm still confused how exactly both work, what is exact >differences between them, The difference is one works and one doesn't. A-TTL is pants, unless you have a certain camera and the wind is blowing from the right direction. E-TTL works. (the real difference is E-TTL uses a preflash just before exposure to set the flash output, just like Nikon, A-TTL uses a kind of infra red preflash during exposure measurement and then normal flash TTL metering during exposure to set flash output.) >I've heard A-TTL flash measurements are linked to the active AF sensor >for given exposure, so can handle well off-center subjects (of course if >focused properly). Is that correct ? Sometimes, depending on the camera. FEL works best for off centre (EOS 3, IV) -- David Gordon [EMAIL PROTECTED]
