Dear Andrea,
The F280 light output in FP mode is constant. You can alter the lighting
ratio only by changing the distance between flash and subject. Film speed
and aperture do not affect the ambient/flash ratio.
See http://www.fys.uio.no/~tbryhn/main/F280chart.html
Tom
On Tuesday, April 30, 2002 at 14:31, Andrea Rocca <olympus@xxxxxxxxxxxxxxx>
wrote re "[OM] OM4-Ti and F208 flash - can someone help?" saying:
> Hallo everyone,
> I have bought an Olympus OM-4 Ti with an F280 flash,
> and I I was wondering whether someone could clarify four points of
> information on which the manuals are (for me) not too clear.
> 1) In super FP mode the flash/ camera combination blends ambient and
> flash light.
> What ratio of ambient/ flash light light is used (eg. 2:1, 3:1 etc.)
> 2) Does this also happen in manual mode when setting shutter speeds
> slower that 1/60 sec, or does the flash in this case fire at full power,
> as it would do in normal TTL mode.
> 3) Can I achieve flash exposure compensation by using the exposure
> compensation dial or does the dial only affect the ambient light reading
> 4) Can a combination of altering the film spees (eg setting iso 200
> even if I'm using iso 100) and exposure compensation (to bring back the
> ambient light reading to normal) achieve flash exposure compensation?
>
> Thank you very much in advance
>
> Andrea Rocca
> London, UK
>
>
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