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[OM] OTF Metering system

Subject: [OM] OTF Metering system
From: David Irisarri Vila <valicors@xxxxxxxxxx>
Date: Tue, 18 Aug 1998 01:41:00 +0200
Hi folks,
    I would like to know how OM4Ti brilliant system works? This is
the way I can imagine this outstanding and unbeatable system!!!
Please, come on everybody, tell me something. :-))

The trick is that OM4Ti starts allways in center-weighted OTF light
metering, by means of this the camera has a last reference when you 
are going to push the spot button. For example 1/500s, and after 
you´ve pressed the spot button is 1/250. When the mirror flips up
and the shutter pattern captures a light deviation respect to 1/500
(first EV value stored) it can adjust spot/s metered values.

I think that OTF system works within spot metering. I think when
you take some readings from whatever scene, each point is a relative
value from the other ones beacause all the values are illuminated 
with the same source. If I take a spot reading into a shade projected
from a tree in order to soften the shadow but I want to take into 
consideration the light comming through the leafs; I take (for example)
two values to give the shadow a 66% and only one spot to leafs to give
33%. At the moment of pressing the shutter release a cloud puts over the
sun and the sun light falls 3EV, OMTi have into the memory the 
last value and with the shutter pattern knows that have to decrease the
shutter speed from 1/250s to 1/30s due to 3EV (outstanding system)
This is how I understand this system, there is no need of recording
the angles where you took the values because there is only a powerful
tool to balance relative spot values and if it changes something in
the last moment we have OTF superb system to help us.

A good problem it would be if you are going to shoot with SuperFP
at 1/125s to someone in this shade and the light falls 3EV, how OM4Ti
can switch to Normal OTF??? :-)))

Best regards

Dave


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