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:
>
>
>
>
>
>
> 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.
>
>
>
>
>
>
>
>
>
>
> Date:
>
> Mon, 28 Jan 2008 08:35:17 -0800
>
>
>
>
>
>
>
>
>
>
> 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
>
>
>
>
>
>
> More new features than ever. Check out the new AOL Mail!
>
>
>
>
>
> ________________________________________________________________________
> More new features than ever. Check out the new AOL Mail ! -
> http://webmail.aol.com
>
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|