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Re: [OM] XA2 aperture - fixed or variable

Subject: Re: [OM] XA2 aperture - fixed or variable
From: "C.H.Ling" <pling@xxxxxxxxxxxx>
Date: Mon, 17 Apr 2000 11:29:17 +0800
Although I don't know how they make it, the ?Ê-II works at F11 1/1000s
max. On the other hand a leaf shutter will not create un-even exposure
across film plane like the focal panel shutter.

C.H.Ling


"John A. Lind" wrote:
> 
> The XA2 is "Program Mode" _only_ with three zone focusing settings.  From
> its instruction manual:
>   Lens:  35mm D.Zuiko f/3.5, 4 elements, 4 groups
>   Shutter:  Programmed between-lens shutter
>   Exposure control:  Programmed shutter.  Automatic exposure range
>     2 sec @ f/3.5  to 1/750th sec @ f/14  (EV 2.5 - 17)
> 
> It doesn't say anything about how the program steps through combinations of
> shutter speed and aperture.  It is surprising the shutter is rated to
> 1/750th!  The practical limit on a leaf shutter is about 1/500th.  Shutter
> speeds faster than 1/500th can have problems with producing an even
> exposure across the film plane.
> 
> -- John
>

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