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[Fwd: [OM] Why Oly is in a hole / screens & 280 flash]

Subject: [Fwd: [OM] Why Oly is in a hole / screens & 280 flash]
From: John Hermanson <omtech@xxxxxxxxx>
Date: Sun, 19 Jul 1998 12:10:45 -0400
--- Begin Message ---
Subject: Re: [OM] Why Oly is in a hole / screens & 280 flash
From: John Hermanson <omtech@xxxxxxxxx>
Date: Fri, 17 Jul 1998 14:49:25 -0400
Since the flash in Super FP mode is actually a number of short burst, lasting a
period of time long enough for the curtains to complete their travel, the camera
would have to control each short burst individually, during the exposure (which 


Shawn Wright wrote:

> On 17 Jul 98 at 11:17, ONLYOLYBW@xxxxxxx wrote:
> >  Hans wrote;
> >  The support for Super FP, using the F280 flash is a feature of the 3Ti,
> >  next to TTL flash support, but it works differently compared to the
> >  4Ti, since the camera can only control (cut off) the flash (which can
> >  be done both in TTL and in Super FP mode),
> >
> > SNIP!
> > Hans, I believe you are incorrect here.  In my experience the 3Ti will not
> >  "cut off the flash" in Super FP mode, only in TTL mode.  If it did, Olympus
> >  would not tell us on page 43 of the 3Ti instruction manual to "Select the
> >  shutter speed between 1/2000 and 1/60 sec. and aperture according to the 
> > chart
> >  on the left".
> >
> Speaking as one who's never even *seen* either a 3Ti or a 280, I'd have to say
> that Hans view doesn't *sound* correct either, according to my understanding 
> of
> the F280. If the 3-Ti could turn off the flash in FP mode, as it does in TTL
> mode at 1/60 or less, this would result in part of the frame receiving *no*
> flash exposure if the shutter is above 1/60 (why else would one use FP mode).
> It's my understanding that the whole point of FP is that the flash consists of
> many short bursts such that they appear as a continuous light source to the
> film, even at 1/2000 sec. Cutting off the flash (as TTL does) would reduce the
> FP mode to TTL-equivalent, and its inherent limitation of approx 1/60 max
> shutter speed.
> That said, I suppose this must mean that the 4-Ti /F-280 must calculate the
> required FP flash intensity/shutter speed prior to exposure, since varying
> *either* of these values during exposure would also result in uneven exposure
> across the film plane. (again assuming shutter speed above 1/60)
> Which explains why the 4Ti *cannot* vary the shutter speed during exposure.
> (although the ability to adjust exposure compensation on the 4T with and
> without flash compensation sure would be nice, for adjusting fill ratios. It 
> is
> also my understanding that the F280 does nothing to help us easily adjust fill
> ratios; this is the main reason I haven't sought one out).
> Any corrections to my above thoughts appreciated...
> ========================
> Shawn Wright
> Computer Systems Manager
> Shawnigan Lake School
> 250-743-6240
> swright@xxxxxxxxx
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> < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
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