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The Olympus OM cult

Meter Discrepancies..?

#1
Hello all.
Just bought some Ektar 100, a rare shift into colour for me as I do my own B&W and that's what I like. However have just treated myself to some Peter Shore books, and thought an upcoming trip to Italy would be fun with some colour options.
This got me checking out my metering. I found an internal dimly lit wall in even light and took reflective readings from it. I found that my OM2-SP on manual spot agreed with my OM-1n and my Gossen meter, but then on Auto (not program) the 2-SP indicated that it was about to broadly agree with the spot meter, but, on the pressing of the shutter the exposure itself was clearly much longer.
The same comparison with an outdoor scene and the 2-SP on auto sounded as if it delivered a 125th as indicated by the other meters and its own spot meter.
So.. Is this normal? Is the OM2-SP on auto in a lower light-level situation simply saying, "Oh - I see... Now I can see it clearly as the light is reflected back live onto the sensor during the exposure, and I reckon I need to give it more than I thought!" and doing the right thing? Or is the auto side of the camera making a mistake and being, dare I say it... unreliable? From memory this has been how it behaved for some time (longer exposure on auto than it indicated would be right before exposure), and I have not noticed a problem with the negs, though with B&W film there is more latiude for it being wrong than there would be with Ektar - hence the post.
I thought this might be something that others had come across.
 
#2
Did you have a film on your OM-2SP or the special card in place of the film?
No? Then your meter in Auto is metering from a black film pressure plate and not the film which has a different reflecting value. And that's why it is applying a bit more exposure than what was indicated in the viewfinder.
Ektar is a colour Negative film and still has some good exposure latitude, broadly the same as a B&W negative. It is only colour slide film that has a narrow latitude.
 
#3
Ricardo! That's it. Of course. Thank you. In with the Ektar, no worries.
Thanks again,
Jim.
 
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