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[OM] Re: Fwd: F280 question

Subject: [OM] Re: Fwd: F280 question
From: Tim Hughes <timhughes@xxxxxxxx>
Date: Mon, 28 Jan 2008 23:46:54 -0800 (PST)
The shutter travel I think is a little different on the OM77, so the slit width 
is different and
hence GN is different for a given set of settings. 
John could verify that this is true.

Tim Hughes

--- usher99@xxxxxxx wrote:

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> Thanks Chris, Winsor, Tim,
> 
> This is a confusing flash.? The mode switch is misleading with one?labelled 
> ?"TTL auto"?as the
> output in FP mode is fixed and the fill should add little to the overall 
> exposure.? I do
> understand how the high freq flashes at as a flash bulb equivalent and how 
> the GN decreases with
> increasing shutter speed.?? The GN's are?also different on an OM 707--huh???
> Little advantage of? TTL? mode if it is fixed---ran across this chart:
> 
> http://www.fys.uio.no/~tbryhn/projects/F280chart.html
> May as well be totally manual.
> At least the light lost from extension?will attenuate the ambient and flash 
> the same amount.
> Hmm, back to the drawing board.
> 
> Mike
> 
> P.S. first 2 notes seemed to bounce, perhaps 3rd time is charm. 
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> Date: 
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> Mon, 28 Jan 2008 08:35:17 -0800
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> Correct. It is almost exactly like a tiny M type flash bulb. It is so  
> weak I doubt you would ever have to dim it.
> 
> 
> 
> Winsor
> Long Beach, California, USA
> 
> 
> 
> 
> On / January 28, 2008 CE, at 12:39 AM, Chris Crawford wrote:
> 
> > I think the F280's output is always the same in FP mode, it can't be  
> > dimmed.
> > The exposure is controlled by aperture and shutter speed both, which  
> > also
> > affects ambient exposure. This is unlike normal flash where background
> > exposure is controlled by the combination of aperture and shutter,  
> > but only
> > the aperture affects the flash exposure. So I think your only means of
> > changing the F280's output is by controlling flash-to-subject  
> > distance, or
> > by putting neutral-density filters over the flash to dim it if its too
> > bright
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