In a message dated 3/16/99 10:39:53 AM Eastern Standard Time,
williams@xxxxxxxxxx writes:
<< "The OM-4Ti is probably better capable of Super FP flash because it can
measure
the influence of both the flash and available light during exposure."
This is not correct. It is a major point of confusion. It's been discussed
before, but maybe it needs to be rehashed.
Super FP is a _manual_ mode of flash operation. Instead of firing one big
burst
of light, the flash puts out several hundred smaller bursts over a period
slightly longer than 1/60 of a second. Other than changing your distance from
the subject or sticking a handkerchief over the flash tube, neither you nor
the
camera have any control over the flash's output.
Super FP is strictly for fill-in. The camera's normal controls (aperture and
shutter) set the base exposure, with the flash providing fill-in at
"reasonable"
subject distances.
In order for Super FP to be fully automatic, it would have to know the
distance
to the subject, the f/stop selected and the scene brightness, _before_ the
exposure. The OM cameras do not supply the first two pieces of information,
so
Super FP cannot provide _automatic_ fill-in flash.>>
No, the OM-4T(i) DOES provide automatic Super FP flash. It does it by
controlling the shutter. As the first curtain begins to open the flash starts
emitting. The second curtain is released as soon as enough light has been
metered. The flash continues emitting at the same brightness until the second
curtain is fully closed. It's like turning on a photoflood right before you
take the picture, then using OTC/OTF metering to determine the shutter speed.
The OM-3Ti, on the other hand, does Super FP in a strictly manual mode (GN
calculations) because the metering system has no control over the shutter.
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