A-TTL uses a preflash to calculate flash exposure. On the EOS 5 (which I've had direct experience with), it only works in (P)rogram mode, and always seems to pick smallish apertures like f/11 which makes it useless indoors. Plus the preflash will confuse the subject.

I found that Canon's 4-zone TTL flash metering to be more forgiving than E-TTL (which is essentially a spot meter based on the active focusing point)

Yes, you can use a Lumiquest or similar light modifier on the 540EZ. No adjustments are neeed (although the maximum distance is reduced somewhat). These devices eat up around 1 1/2 stops.

On Wednesday, October 30, 2002, at 08:36 PM, Skip Middleton wrote:

No more useless than straight TTL, I guess. Just what is the difference
between A-TTL and TTL? And, as an aside, can I use something like a
Lumiquest on the 540EZ, and what, if any, adjustments need to be made?
Skip Middleton
www.shadowcatcherimagery.com
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