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Does auto mode of flash metering have any advantage over TTL?

One advantage that I can think of is the absence of a pre-flash in the auto metering, which can make some people blink. (But I rarely use direct flash anyway, so a TTL pre-flash doesn't seem to make people blink if it's bounced. Alternatively, I can get a meter with a pre-flash, lock the flash value, and shoot without preflash.)

So is there any advantage of flash's auto mode at all over TTL, when the camera body is capable of TTL?

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Different manufacturers and systems may define 'auto' differently. Could you be a little more specific about the system within which you wish to compare 'Auto' and TTL? –  Michael Clark Nov 11 '13 at 2:52
It depends on system, but note that the same thing you mentioned with pre-flash and metering can be done on many cameras with TTL if it supports an FE lock. On my 5D Mark iii I frequently will do a pre-flash/FE lock before taking the actual image and it seems that this avoids the pre-flash (though my preflash is often so fast it's hard to notice). –  AJ Henderson Nov 11 '13 at 14:52
Basically by "auto" I mean exposure by a thyristor sensor on the flashgun itself, as opposed to the through-the-lens metering taking place in the camera body. –  Anon Dec 1 '13 at 5:13
The more I think about it, I only see things to add to the "cons" column of the auto flash compared to TTL: it doesn't know the presence of any filter put on the lens, and it's not as good at metering for an off-center subject (you can but you have to carefully aim the thyristor sensor at the subject, which will be hard with on-camera-flash). –  Anon Dec 1 '13 at 5:16
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