Grega Fenko wrote:
>
> >3. Is the brightness of the flash constant or does my camera change it in
> >different situations? Does the flash compensation affect this?
> >
> Brightness/intensity of flash is calculated (precalculated) for every
> situation and camera metering system sends it to flash unit. Applying flash
> compensation changes flash output for desired/set amount of compensation.
No, no, no, the "brightness" of the flash is the same every time. The
only way an electronic flash can vary it's output is by varying it's intensity.
When using a flash, the duration of the flash and the lens aperture
control how much flash light hits the film and the shutter speed and
lens aperture control how much ambient light hit the film. It is
possible that the EOS flash has a fixed duration and basically the
aperture controls the film exposure and the shutter speed controls ambient.
I doubt that EOS flash is fixed duration as there are tremendous
battery-saving advantages of using a short little pip (approximately
1/30,000 sec) when you don't need much light.
Mr. Bill
*
****
*******
***********************************************************
* For list instructions, including unsubscribe, see:
* http://www.a1.nl/phomepag/markerink/eos_list.htm
***********************************************************
