Yes it was a 45mm (?) GN lens (guide number lens), you set the guide number,
the lens automatically sets the f stop based on focus.
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----- Original Message -----
From: "dreammoose" <dreammoose@xxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Tuesday, April 09, 2002 3:56 PM
Subject: Re: [OM] Re: Flashmatic -was: Oly digest V2 #3283
> I seem to recall that Nikon had a lens for the 'F' series that included
> flashmatic capability, maybe a 45mm, small in any case. Seemed like a
> good idea 30+ years ago, but I switched to an OM-1 and later added an
> OM-2n with T32 for TTL.
>
> Moose
>
> Paul Farrar wrote:
>
> >>I recently bought a 35-SP which has "guide-number flash" settings on the
> >>lens. I wanted to see how this works, so I set the lens for a guide
number
> >>(~60 in feet) and then opened the back of the camera. As you move the
focus
> >>lever from infinity to closer, the lens aperture closes down, which you
can
> >>see from the open camera back. Pretty cool, and allows use of
non-automatic
> >>flash with this camera. I think several of the old Olympus leaf-shutter
> >>rangefinders had such a system.
> >>
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