My experience with the G40 is limited. But based on your letter, it sounds
like that the built in flash automatically underexposes by 3 stops when the G40
is used.
Per Nordenberg wrote:
> -----Ursprungligt meddelande-----
> Från: John Hermanson <omtech@xxxxxxxxx>
> Till: olympus@xxxxxxxxxxxxxxx <olympus@xxxxxxxxxxxxxxx>
> Datum: den 1 mars 1998 22:41
> Ämne: Re: [OM] OTF in IS-3?
>
> >At a factory set combination of asa-distance the camera switches between
> >top flash tube (low power) and >bottom flash tube (higher power.) There is
> >no otf flash control or cell to read flash exposure as in a regular >auto
> >flash (thyristor).
> >The IS-3 will set f stop with flash based on distance but also which flash
> >tube is going off., but that is the only >control it has.
> >
> >John
> >Camtech
> >
> When the built-in GN28 flash and the optional G40 flash are used together the
> G40 fires full emission, but the built-in GN28 flash is compensated by -3EV.
> I know what exposure values means, but what exactly does this mean? It can´t
> be that compensation is by aperture value, because that would effect the G40
> as well. Is just the upper GN20 tube fired in this situation?
>
> Since the IVP flash system is based on distance, how does it behave in power
> (manual) focus mode? In which way is distance determined?
>
> Sorry for all these questions
>
> Per Nordenberg
>
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