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[OM] Re: om-2s, auto/manual light-metering don't agree.

Subject: [OM] Re: om-2s, auto/manual light-metering don't agree.
From: bartjew@xxxxxxxxx
Date: Sun, 12 Feb 2006 13:27:10 +0100
Just a refinement of this excellent summary:
The centre circle of the 1-4n shows the correct spot; the circle in the older 
1-4 (without the 'n') is about twice too large.

Bart


Citeren Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>:

> Yes, Wayne is correct.  When in auto or program mode the 2s uses center 
> weighted averaging of the whole frame.  When in manual mode it uses spot 
> mode which sees only 2% of the area.  If you use a 1-4 or 2-4 screen the 
> spot metering area is indicated by the small circle in the center of the 
> screen.
> 
> I usually use my 2s's in manual mode and I treat the mode switch as a 
> metering mode switch.  Switch to auto mode to read the averaged exposure 
> and then switch back to manual for more control.
> 
> If you use program mode you should be aware that the camera cannot close 
> the lens to a smaller aperture than you have manually selected.  So, 
> unless you want to deliberately restrict the camera's options set the 
> lens aperture to f/16 or whatever is the smallest aperture for the lens 
> in use.
> 
> Chuck Norcutt
> 
> Wayne Harridge wrote:
> 
> >>I'm testing my new om-2s in room light, auto and manual 
> >>always give the same f/shutter speed except  focusing on a 
> >>bulb. In the case of manual I got f=8/shutter=1000, but in 
> >>auto mode they are f=8/shutter=125. Is it normal ? My 
> >>assumption is auto mode use a different light metering 
> >>procedure from the manual
> >>mode(center-weighted) ?.
> >>
> > 
> > 
> >>From my recollection of the OM-2S(P), manual mode is *always* spot
> metering,
> > auto is *always* centre weighted average.  I think that explains your
> > observations.
> > 
> > ...Wayne
> 
> 
> 
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