Christine Nielsen wrote:
Last night, I attended a "portrait workshop". We were shooting at the
beach, at the end of the day. It was still very bright, and in the
shade of a lighthouse, some fill was required on our models' faces.
No problem. I had the AF540 on my k-7...using aperture priority mode,
and -1.5 Flash EV, I took some shots. Gah. Way overexposed. I
fiddled, set the flash to high-speed sync, and tried again. Still
hot. I proceeded to try several other manipulations... none really
working, until I settled on a fully manual operation for exposure, and
flash (1/16).
It shouldn't have to be this way, though, right? I should be able to
use pttl to provide (more or less) the right amount of fill, yes? I'm
even pretty sure I've done it successfully in the past, though it
would have been with the AF360.
What am I doing wrong?
Christine, I don't think the P-TTL works perfectly (far from that!), but the
bad problem you are reporting usually happens when you use aperture priority
and have aperture & ISO settings so that he camera would use fast shutter
speeds (e.g. 1/500 sec) in bright sunlight. At that point, by activating the
flash, you force the shutter speed to say /1/160 sec (or slower, in case of
camera/flash set to slow-speed synch) and that's enough for getting bad
overexposure, with the added flash light on top of it. It happened to me and
that's the reason for the mess.
When using the flash for compensating backlight, check that the shutter
speed set by the flash activation won't overexpose available light! In case,
either change aperture/ISO or set high-speed synch.
Cheers,
Dario
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