Archived posting to the Leica Users Group, 2002/01/13

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Subject: RE: [Leica] NEW M7 MAJOR CROCK-POT CROW PARMESAN
From: "Frank Filippone" <red735i@earthlink.net>
Date: Sun, 13 Jan 2002 08:56:44 -0800

This is a good point...... lengthening the flash is a possibility to make
the flash synch across the slit.... but the length of time you must keep the
flash in light mode is quite long, and would give a lot less light
output.....but of longer duration, so the integration of that light is
slightly improved.. you do not lose as much as you might first
think.......It would require a custom made flash......  My old Strobonars
would not work with it in this mode......

Does anyone know the time it takes the M6 shutter to move accross the focal
plane in speeds of 1//125 and 1/1000 of a second? ( those are the slit
shutter   speeds....)

Frank Filippone
red735i@earthlink.net


Canon EOS range of cameras which have what
they call FP flash which allows the flash to synchronise at all shutter
speeds (up to 1/4000th second on my EOS 50E - probably higher on the EOS
1V).

It just so happens that in the current edition of EOS Magazine, dated
December 2001, there is an article which describes FP flash. Basically, the
flash duration is extended to the length of the exposure, e.g. 0.25
milliseconds at 1/4000th second shutter speed. This means, though, that the
intensity of the flash is reduced so it's most beneficial for fill-in flash
where the subject is not too far from the camera.

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