On Tuesday, April 23, 2002 at 22:14, Winsor Crosby
<olympus@xxxxxxxxxxxxxxx>
wrote re "[OM] F280 ModPhoto" saying:
> Here are some excerpts from the Modern Photography, June 1987,
> article on the OM4T.
>
> Reference is made to earlier articles on the flash: Aug. 86(SLR
> Notebook) & Mar. 87(OM77AF), which I don't have copies of.
>
> "...When the flash pulses throughout the entire exposure, it acts
> more as a continuous light source than as a flash of light. Like
> available light, it's measured by the camera's normal center weighted
> OTF metering system, which closes the second shutter curtain the
> instant the mix of flash and natural light on the scene has produced
> the proper exposure."
>
> "...In Super FP mode you can use any shutter speed above 1/60 sec.
> and be assured of full flash coverage. (If you could use Super FP
> flash at speeds slower than 1/60 sec. it would flash for only part of
> the time the shutter was open, leading to possible under exposure.
> The camera does not allow this and signals "under" if you attempt
> it)..."
>
> "...Only at closer distances and lower shutter speeds, 1/60 to 1/125
> sec. do you get enough light to expose a subject by flash alone in
> Super FP mode.
Shutter speed doesn't matter, just flash to subject distance and ambient
light.
> "...Although illumination provided by the F280 flash is constant in
> FP mode, the amount of fill can be controlled relative to ambient
> light by selecting higher or lower shutter speeds.
Wrong. The fill ratio is controlled only by flash to subject distance.
> This is accomplished by changing the lens aperture in automatic
> mode. If you set a lower shutter speed, the amount of fill-in
> flash will be greater. Moving above 1/250 sec. will darken the
> shadows(as well as freezing the action and minimizing depth of
> field). Although background exposure will remain correct, there
> is no automatic way to determine what would be the proper
> fill-to-ambient-light ratio for each subject. Often this is a
> matter of taste or personal preference. Although there are no
> hard and fast rules for obtaining optimal balance, with a little
> experimenting you should quickly get a feel for it."
Wrong. The fill ratio is controlled only by flash to subject distance.
> -- Winsor Crosby Long Beach, California --
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