Dan,
> Hi,
>
> When playing with on camera flash (with the on camera flash)
> compensation settings I can not see any flash out-put difference when
> dialing in a flash comp from -2 stops to +2 stops in any mode.
> Then only time I can see a difference is when shooting in Av mode when
> shooting at f2 or f22 (and in between) and with not dialing in a comp
> difference, the camera does this by it's self.
In wich situations did you see no difference? Did you look at the negatives
or at the photos? Or did you just looked into the flash? :-)
> Is the flash comp related to flash power or a time value? In above
>mentioned Av mode the difference is quite large. The manual is a waste
> when it comes to flash.
The regulation of flash-power is always with the time value. The flash
starts with building up to full power, stays at that level until the power
is cut off.
When the camera has measured enough light, the power is cut-off
(TTL). So the amount of light is power * time. This is also how the green
light-conformation works: if there is still power left, because not all the
available power has been used, the green light (still) lits up.
If you just looked into the flash when you where playing with your camera,
this also explains why you didn't see any difference. The time-difference
isn't something you can see by your naked eye, but in case there is a huge
difference (f2 compared to f22), you can 'see' that with a very low needed
amount of light, the flash has no time to come to full-power before it is
been cut-off.
Drikus
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