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.
"...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. 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."
--
Winsor Crosby
Long Beach, California
?
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