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[OM] Aperture Communications (Was something else)

Subject: [OM] Aperture Communications (Was something else)
From: CarlMarin <CarlMarin@xxxxxxx>
Date: Wed, 14 Jan 1998 11:28:55 EST
In a message dated 98-01-14 01:50:01 EST,Chris write:

> 
>  The ACTUAL aperture is not known to the body, only that the lens is
>  stopped down N stops.
>  
>  T

Hi Chris,

Of course the whole scheme is an analog by gosh and by golly sort of
arrangement.  I never really thought about this part of it before,  maybe its
a trick question.  How does the camera know whether you've got a f1.2 or an
f3.5 screwed on so it can give you compensated wide open correct readings?  If
it's basically a case of the light coming thru the lens is the light coming
through the lens and the body doesn't care, then why would something like my
Tamron 500f8 mirror need an fixed aperture tab at all to get correct exposures
out of the camera as it is shot wide open all the time, doesn't stop down?
(On auto, of course the shutter speed would adjust but in manual, its out in
the ozone without the tab, thinks its got an f2 or something screwed on).  

Carl  

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