>From: Gary Kaplan <[EMAIL PROTECTED]>
>
>How do you do this and not end up with underexposed backgrounds? I would
>like to do this because I often find the shutter speeds to be to slow
>when I use AV. But, I am concerned that if I set the f/stop and shutter
>speed myself I will end up with underexposed backgrounds.
>
>Gary
>
>
>Bob Meyer wrote:
>
> > When I want a specific aperture, and also want a
> > handholdable shutter speed, I just put the camera in
> > "M" mode. The flash exposure calculation is still
> > automatic, so you really haven't lost anything.
> >
> > =====
> > Bob Meyer
My concern is how do I avoid OVERexposed backgrounds in such case?
I can live with dark backgrounds because they are often unavoidable
with flashes.
Sometimes the background exposure is changing so much that using
one setting in M-mode would cause overexposure in some photos.
Watching and changing the exposure could mean loosing some moments
(thus photos).
Av and P-modes could and would mean too long shutter speeds.
Tv-mode would mean that camera is using the largest aperture
when light level gets too low.
This problem only exists when lighting is changing around the
handholdable shutter speed.
Solution 1:
If I could limit the slowest shutter speed in Av mode to what I want
(e.g. 1/focal length) when flash is on and ready I could set
the aperture to what I like and flash and Av mode together would
take care of the exposure, both for foreground (Av and flash) and
for background (mostly Av mode).
Using the SafetyShift function (e.g. EOS-3) would give the "best"
possible background exposure because it would allow the camera to
select larger aperture than what I selected when the set shutter
speed limit has been reached.
If also the flash output reduction for fill-flash operation would
step in when the selected shutter speed is reached the system would
be (?) almost perfect...
Solution 2:
Also P-mode with limited slowest shutter speed or Tv-mode could
be practical when you don't care about the selected aperture but
just want the background exposure to be as good as possible.
Vesa
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