No, it doesn't need to know the f/stop. It needs to know:
1 How much light is cominh through the lens at fully open aperture;
and
2 By how many f/stops the lens is stopped down below its fully open
aperture.
It therefore doesn't matter to the camera metering system whether the lens
is a 500/8 or a 50/1.2 and thus the position of the aperture reporting lever
is simply the lens' actual aperture setting relative to fully open aperture
- it does not report that "this lens is currently set at f/11". Take a look
at a 500/8, compare it with a 50/1.2 and you will see what I mean.
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Simon Worby
Sent: 16 January 2005 08:43
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Zuiko 35-105 question
---snip
Since the camera needs to know what f-stop is selected to give correct and
accurate light meter readings, how does it know (or doesn't it?) on the
earlier model when the aperture lever should in fact be somewhere between
3.5 and 4.5 (i.e. at anywhere longer than 35mm), but isn't? Or are the light
meter readings just up to about 1/2 stop out?
--snip
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