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[OM] 1 stop difference between 2 series & 1 series focusing screen?

Subject: [OM] 1 stop difference between 2 series & 1 series focusing screen?
From: "Michael Wong" <mialop@xxxxxxxxxxxx>
Date: Thu, 26 Jul 2007 17:39:54 +0800
Dear all,
I bought one more 2-4 focusing screen & I put the screen into my 1n &
I know there will be affected its metering incorrect. So I have made a
test to find the difference.

First, I record the metering reading by my 4T + 85/2, the reading is
ISO100, F2, 1/4. And then I record reading by 1n + 1-10 focusing
screen & OM-PC as same as 4T. I change the 2-4 focusing screen into my
1n & find the metering is over exposure with ISO100, F2, 1/4. And then
I change the ISO to 50 & find the metering shown "correct". I wonder
there is 1 stop difference between 2 series & 1 series focusing
screen. So I make the 2nd test as reading ISO400, F2, 1/15 by 4T &
OM-PC. Same as 1st test, I adjust the ISO to 200 & metering "correct"
for my 1n ................

I wonder 2 series just 1 stop brighter than 1 series screen? It looks
very bright through VF ..................


Or my test method is wrong???????



-- 
Michael

An Olympus OM system fans

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