Hi Marco,
> As this question might be asked before, I hope not to bother anyone.
No problem.
> Here comes my request: last monday, I shot at a climbing competition
> with my EOS 5, Speedlite 430 and Sigma 2.8/70-200HSM. I was using
> Sensia 400. Almost all pics were quite good - the spotlight on the
> climbers sometimes was bright enough to shoot at 1/180s and f2.8.
>
> But one pic was absolutely not what I expected: people in the
> foreground were totally overexposed (I guess +2) and the background
> (some 5-8m away) was exposed correctly. O.k., I was shooting in P
> mode, so I understand that the camera/flash tries to expose the
> background correctly.
No, in P-mode the camera tries to expose the subject correct, but does not
always take in account the background, because it wants to have a
shutter-speed that is high enough to hand-hold. In Av, Tv or M mode the
camera will (try to) expose the background correctly.
> But how can I avoid this the next time? Setting
> speed and let the camera select f-stop? When the f-stop in the
> viewfinder starts blinking this means that the background will be
> underexposed, right?
Yes, your right :-) But take also in account that the EOS-5 will use the
cental focus point to measure the needed light for the flash, unless you
link this measurement to the actual focus-point (With CF's) and don't use
ECF. In other words: your subject you want to expose by the flash should be
covered by the actual focus point that is measuring the flash exposure.
> But how can I know how strong it will be underexposed?
Set a longer shutter time, and count the stops when putting it back.
Best methode IMHO is to set it to Av, Tv or M, set a speed and/or f-stop you
want to use to expose the background, set the appropiate CF's as explained
above and shoot away.
> Any help is appreciated,
Hope this helps.
Drikus
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