550EX or 540EZ on EOS 3 and EOS 1D MKII

Started May 15, 2004 | Discussions thread
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eos_feng
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550EX or 540EZ on EOS 3 and EOS 1D MKII
May 15, 2004

I found a very good price for 540 EZ on eBay, like nearly 1/3 of the 550EX normal price... and want to be the winner of that...

However, 550EX is described as special dedicated for EOS 1(v/n) and EOS 3 and EOS 1D(s) (mkII). 540EZ is described as for all A-TTL. What does A-TTL mean?

One is special dedicated, the another one is not, are they different in practical use? What sort of difference?

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