TAKO. INTERNET SEIT 1996.
Olympus-OM

Re: [OM] OM4Ti - Memory Function

Subject: Re: [OM] OM4Ti - Memory Function
From: "Giles" <cnocbui@xxxxxxxxxxxxx>
Date: Mon, 2 Aug 1999 22:30:30 +0000
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Message-ID: <27b93ac5.24d714d0@xxxxxxx>
Date: Mon, 2 Aug 1999 11:35:44 EDT
Subject: Re: [OM] OM4Ti - Memory Function
To: olympus@xxxxxxxxxxxxxxx

I'm probably beating a dead horse, but I need the exercise, anyway:

OM-4(T(i)) metering:

(A) Center weighted auto - when the meter is activated, the sensor at the 
bottom of the meter box takes a center-weighted average reading off of the 
sub-mirror. This is used to indicate the approximate shutter speed in the 
display. When the shutter is released the same cell makes a center-weighted 
reading off of the curtain and film. How much of the reading is made off of 
the curtain vs. off of the film is a function of shutter speed. Longer 
shutter speeds result in more of the exposure being calculated off of the 
film.

(B) Center-weighted auto with memory - when the meter is activated, the 
sensor at the bottom of the meter box takes a center-weighted average reading 
off of the submirror. This is used to indicate the approximate shutter speed 
in the display. If you press the MEMO lever the display will continue to 
indicate the immediate center-weighted reading, which has not yet been 
memorized. When the shutter is released the same cell makes a center-weighted 
reading off of the curtain and film. The shutter speed actually used to make 
this exposure is the one used to calculate the LV that is stored in memory.

(C) Spot and multi-spot auto - When the meter is activated the display is 
showing the center-weighted reading, as described in (A), above. When the 
SPOT button is pressed, a single spot reading of the center area of the 
screen (as defined by the microprism collar on the standard screens) is 
memorized and indicated in the display by a small diamond, and the bar graph. 
A second diamond appears which indicates the immediate, real time spot meter 
reading. If the SPOT button is pressed again the second reading is averaged 
with the first one, and the bar graph indicates the averaged exposure, which 
will be the one used. A third diamond then appears, again showing the 
immediate spot reading. You can repeat this for up to 8 readings. If SPOT is 
pressed a ninth time the first reading is lost. When the exposure is made the 
indicated shutter speed is used. There is no OTF exposure in SPOT mode. After 
the exposure is made the spot readings are erased, unless you  use...

D) Spot and multi-spot auto with memory - If you activate the MEMO function 
after having made some spot readings the LV will be stored and can be used 
for subsequent exposures.

Now I could get into hi-lite, shadow, flash, manual mode, etc... but I think 
this post is long enough. I hope it helps someone out there.

Paul Schings
Coventry, Rhode Island USA


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