----- Original Message -----
From: "Paul D. Farrar" <farrar@xxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Sunday, December 15, 2002 6:19 PM
Subject: Re: [OM] TTL vs. Auto on the OM-4T and Metz
> The TTL sensor in the 4T starts measuring as soon as the 1st curtain
> is released. If the ambient light is not totally insignificant, it will
> reduce
> the flash by the amount of ambient light. If the SS indicator was on 1/30s
> when the shutter was released, half an exposure will have accumulated
> before the flash is fired; so the flash will be reduced by half.
>
The following isn't very clear. I should have said, "The 54MZ, when set on
auto (not TTL), doesn't know ..."
> The flash doesn't know to start measuring until it gets the signal to
fire,
> and while the flash is on, it greatly exceeds ambient; so it will always
> give a full exposure. For higher levels of ambient light, you may have to
> compensate.
>
> I recommend running test series.
>
> Paul
> ----- Original Message -----
> From: "Richard F. Man" <richard@xxxxxxxxxxxxxx>
> To: "oly" <olympus@xxxxxxxxxxxxxxx>
> Sent: Saturday, December 14, 2002 5:37 PM
> Subject: [OM] TTL vs. Auto on the OM-4T and Metz
>
>
> > Is there a difference, result-wise, with these TTL vs. auto mode with
the
> 4
> > or 4T combined with the Metz 54? I understand the light reading is
> > different - in auto mode, the flash's sensor reads the light whereas in
> TTL
> > mode, the camera reads the exposure OTF at "real time." Since the flash
> > sensor position is usually higher than the camera, it may read
differently
> > (especially at close subject?). My question is besides that, is that any
> > difference?
> >
> > Thanks
> >
> > // richard <http://www.imagecraft.com>
> > <http://www.dragonsgate.net/mailman/listinfo>
> > On-line orders, support, and listservers available on web site.
> > [ For technical support on ImageCraft products, please include all
> previous
> > replies in your msgs. ]
> >
> >
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