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Re: [OM] OM-4T Multi-Spot Metering

Subject: Re: [OM] OM-4T Multi-Spot Metering
From: Kennedy <rkm@xxxxxxxxxxxxxxxxxx>
Date: Sun, 10 May 1998 16:04:44 +0100
In article , Greg Heier <greg@xxxxxxxx> writes
>
>Hello all. I'm new on this list, I currently use an OM-2 (made in =
>12/1976, before they changed the shutter metering pattern), and I'm =
>thinking about getting a used OM-4T as a 2nd body (any suggestions about =
>where to buy appreciated). I had a question though about the multi-point =
>spot metering. From what I understand, you aim the center of the =
>viewfinder at the points you want to meter on, one by one, and push the =
>meter button. From the pictures I've seen of the OM-4T viewfinder, it =
>looks as if the points are all marked in the viewfinder. How does the =
>camera keep track of where the points are in the view finder? Are the =
>points selected metered right when you select them or continuously?
>
It meters them at the point you press the 'Spot' button rather than
continuously, so there is no need to track where the points are in the
viewfinder.  You are probably so used to the OTF auto metering of the
OM-2 that you've forgotten that before the OM-2 appeared (BOM-2?) all
auto camera's metered the light before the exposure took place.  The
spot meter in the OM-4 is a partial regression to this mode of operation
- so if the scene illumination changes between making the spot meter
readings and pressing the shutter - tough.  Of course the OM-4 still has
conventional auto OTF metering as well, but this is not used in the spot
mode.

When multiple spots are measured, the camera takes the average of all of
them to compute the shutter speed which is exposed to produce a mid grey
on the film.  If you want more notice to be taken of a particular area
you need to take more readings from there.  The averaging process is
switched off when you press either the smaller Shadow or HiLight buttons
next to the Spot button.

When the Shadow button is used, the camera looks through the measured
spots you have stored in memory, selects the darkest one and adjusts the
shutter speed to make that spot close to black on the film.  Similarly
the HiLight button makes the camera look at the memorised spot readings
and select the brightest one, which is exposed to give white on the
film.

Hope this helps.
-- 
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
Python Philosophers         (replace 'nospam' with 'kennedym' when replying)

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