: > By the way, does anyone know if the OM 3 Ti works the same way as the OM 4
: > Ti when using FP flash at slow shutter speeds? With the OM 4 Ti, you have
: > to calculate F-stop, distance and guide # to get correct exposure, which
: > can be a bit tricky. Does the OM 3 Ti calculate FP flash automatically on
: > all shutter speeds?
:
: According to what I read earlier about a year or so ago (here on this list),
: the OM3Ti is even better than the OM4 because at shutter speed less than 1/60
: the FP flash is still active. Whereas the OM4 flash reverts to 1/60 and
: regular TTL flash.
This must be a misunderstanding. The manual says that when the indicated shutter
speed of the OM-4Ti is longer than 1/60 you should set the camera to manual (and
leave the flash to FP). In manual mode the OM-4Ti uses the F280 exactly like the
OM-3Ti: the flash is synchronized at all shutter speeds from 1 sec to 1/2000
sec, and your exposure calculations must be GN based, where the GN depends on
the selected shutter speed. Biggest problem in this mode, which obviously is the
only mode the OM-3Ti can handle, is that available light is not taken into
account and overexposure can easily happen when there is a lot of it. So to
answer the original question: nothing is calculated automatically, _you_ must do
the calculations just as with ordinary manual (fill)flash. Biggest difference is
that you can select from six different GN's (2.6, 3.7, 5.2, 7.3, 10.4 and 14.7m,
100ASA), depending on the shutter speed used and you no longer are limited by a
sync shutter speed.
The OM-4Ti in Auto mode treats the F280 in FP mode just like an additional light
source, measures the total light Off The Curtain and determines the final
shutter speed during exposure, so overexposure is much less likely. When the
indicated shutter speed is longer than 1/60 and you leave the camera to Auto,
despite what the manual says, the shutter speed is fixed at 1/60, but the flash
remains in FP mode, not regular TTL flash (you can note the difference by
watching the charging time), and the exposure will probably be wrong.
h@nz
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