Also, the semi-silvered mirror passes polarised light for the initial
reading. If the light coming in is polarised one way or another, the OTF
(or Off The Curtain) exposure may be different from the initial one, since
all light is passed when the mirror is out of the way.
tOM
On Sunday, August 18, 2002 at 9:14, Paul D. Farrar
<olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] F280 flash fails to fire" saying:
> Since the body controls the flash in normal mode, it was the body.
> Probably because it used a speed less than 1/60. The viewfinder speed
> is an estimate, not the actual speed that will be used. Even though
> both the viewfinder estimate and the actual exposure use the same
> meter cell, they view the scene differently: viewfinder through a
> mirror arrangement, actual exposure from reflection off the film and
> shutter curtain (50/50, at sync speed). The strong backlighting may
> cause them to read differently. If I expect flash, and get none, I
> just close down aperture a click and shoot again.
> From: "John Hudson" <jahudson@xxxxxxx>
> > Using an OM4T with a 90/f2 and a 50/f1.2 my camera mounted F280 failed
> > to fire on several occasions where there was bright backlighting but the
> > subject matter was in dark shade ...... people standing in a poorly lit
> > room against opened doors leading to a brightly sun lit exterior. The
> > distance from flash to subject was circa 12 feet. I had the flash set to
> > "normal" [because the shutter speed recorded less than 1/60 second], the
> > aperture set to ~f5.6, and the camera set to auto and I was using 160
> > ISO Portra. The subjects were framed within the centre of the
> > viewfinder. Can anyone suggest why the F280 failed to fire. It was
> > properly fitted into the shoe on the camera, I was using new batteries,
> > and the charge light was lit up.
> >
> > On all occasions when there was less intense back lighting the F280
> > fired but then I was using Super FP mode.
--
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tOM Trottier, ICQ:57647974 http://abacurial.com
758 Albert St, Ottawa ON Canada K1R 7V8
+1 613 860-6633 fax:231-6115 N45.412 W75.714
"The moment one gives close attention to anything,
even a blade of grass, it becomes a mysterious,
awesome, indescribably magnificent world in itself --
Henry Miller, 1891-1980
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