In the OM4 the viewfinder indicates UNDER or OVER after the flash, so something
somewhere knows more than 'it was quenched'...
br
jez
ps - one of my few gripes about the OM4 - the viewfinder illumination shuts
down immediately after a flash has been taken. And when do you typically use
flash? Yup, when it is dark, and you have deliberately pressed the titty to
turn _on_ the vf illumination...
----- Original Message -----
From: john@xxxxxxxxxxxxxxxx
To: olympus@xxxxxxxxxx
Subject: [OM] Re: T32 & T20 "hole" in the "O"
Date: Sat, 06 Nov 2004 19:42:27 +0000
>
> On Thu, 4 Nov 2004 21:39:12 -0000, "Simon Worby" <simon@xxxxxxxxxxxx>
> wrote:
>
> >Also (and sorry for the questions) what is it that creates the signal for
> >the rapid flash to indicate correct exposure? Do to the fact that (IIRC) it
> >happens on the OM-1N as well as the OM-2N, I assume it's the flash unit
> >rather than the camera, even in "Full auto control by OM-2" mode.
> >
>
> AFAIK provided that the flash is quenched (before the capacitor has
> discharged completely), the quench circuit will generate the "OK"
> signal. If you don't get the signal, it means that the capacitor has
> discharged fully and the result may be under-exposure. In turn, the
> instruction to quench (the thryristor circuit terminates the flash
> before the capacitor has discharged fully) is derived from the camera
> in TTL mode or the light sensor in the "O" in Auto mode.
>
> Regards
>
>
> John Gruffydd (Mold, Wales, UK)
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