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Re: [OM] f stop adjustments with F280 flash

Subject: Re: [OM] f stop adjustments with F280 flash
From: Jez.Cunningham@xxxxxxxxxx
Date: Wed, 22 Jan 2003 10:31:54 +0100
John,

On the F280 'Normal' mode means 'TTL off-the-film auto'.

If you also had auto mode selected on the camera it would use TTL
off-the-film metering and whatever aperture you select will have no effect
on exposure.  (Exception, but not applicable here: the subject distance has
to be close enough for the flash power to be enough, and you said it's only
3 feet, and not so close that the flash can't be quenched quickly enough.)
So when you say you dialed up -1 stop I would have to ask 'relative to
what?'

Use the ISO setting to adjust exposure!

best regds
Jez





"John Hudson" <13874@xxxxxxxxxx>@Zuiko.sls.bc.ca on 21-01-2003 05:28:52 PM

Please respond to olympus@xxxxxxxxxxxxxxx

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Subject:    Re: [OM] f stop adjustments with F280 flash



----- Original Message -----
From: <Jez.Cunningham@xxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Tuesday, 21 January, 2003 12:05 PM
Subject: Re: [OM] f stop adjustments with F280 flash


> I would say it depends if you dialed up the -1 in the aperture setting or
> the ISO/ASA setting?
Aperture setting

> And if the 'AUTO' mode was the Camera or the Flash?
Auto mode on camera. The F280 does not have an Auto mode.

> br
> jez

>
>
> "John Hudson" <13874@xxxxxxxxxx>@Zuiko.sls.bc.ca on 21-01-2003 04:16:30
PM
>
> Please respond to olympus@xxxxxxxxxxxxxxx
>
> Sent by:    owner-olympus@xxxxxxxxxxxxxxx
>
>
> To:    "LIST - Olympus" <olympus@xxxxxxxxxxxxxxx>
> cc:
> Subject:    [OM] f stop adjustments with F280 flash
>
>
> The close up image I posted of our young cat was taken with an OM4T /
90mm
> f2 macro / F280 flash on camera. The camera to subject distance was about
> three feet.
>
> The aperture used was f5.6 or f8 and the exposure mode was set to "Auto".
> On
> a gut feeling that the proximity of flash to subject was abnormally close
I
> dialled up a minus 1 exposure factor on the camera. The density of the
> negative looks OK.
>
> My question is ........ did dialling up a minus 1 exposure factor have
any
> impact on the exposure of the negative? When used without flash the minus
1
> dial up would result in a one stop under exposure. When exposing with
F280
> flash does the interaction of the camera with the flash gun override any
f
> stop compensation one may have set?
>
> John Hudson
>




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