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

Subject: Re: [OM] Why Oly is in a hole / screens & 280 flash
From: "Shawn Wright" <swright@xxxxxxxxxxxxxx>
Date: Fri, 17 Jul 1998 10:37:20 -0800
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),
> 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

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