I think the OM4 is center-weighted only in manual mode, that is the reading
you see on the viewfinder. In normal auto mode, it is average metering, same
for OTF and OTC. The thing contributed to center-weight is the second mirror
not the field of view of the metering photodiode.
You can check the meter by pointing to a light bulb, record the exposure by
placing the bulb in different position on the viewfinder with the memory
function provide with the OM-4 or 4Ti.
C.H.Ling
-----Original Message-----
From: Chuck Norcutt <norcutt@xxxxxxxxxxxxx>
To: Olympus mail list <olympus@xxxxxxxxxxxxxxx>
Date: Monday, October 18, 1999 10:47 AM
Subject: RE: [OM] OM2 w T-32 was (Fwd) OM-2 Meter
>Chip said:
>
>Yes, but if you look at an OM4 shutter curtain, there is not an obvious
>center
>weighting to the pattern of white. This suggests to me that in this
>camera at
>least, the centerweighting is largely a product of the field of view of
>the
>metering photodiode.
>
>Is the early OM2 meter definitely not center-weighted?
>
>----------------------------------
>
>Sorry if I wasn't paying attention to earlier posts on this subject but
>Chip's question finally inspired me to go look at my OM-2 and OM-2n.
>The OM2 speckle pattern is center weighted vertically but the pattern is
>even horizontally. The OM-2n on the other hand has an even distribution
>over the full surface.
>How come?
>
>ps: The unofficial sales info file doesn't mention this difference in
>the metering method between the 2 and 2n.
>
>Chuck Norcutt
>Woburn, Massachusetts, USA
>
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