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[OM] Film Reciprocity Failure question

Subject: [OM] Film Reciprocity Failure question
From: Albert <olympus@xxxxxxxxxxx>
Date: Tue, 02 Sep 2003 13:35:50 +0800
Well, some of my pics.. The 20 second exposures didn't look all that much brighter than the 10 second ones. I looked up some of the film data, and it all says "for exposures longer than 10 seconds, make sure you compensate properly." Thanks..

So I'm assuming that I expected 20 seconds to be 1 f-stop more than 10 seconds, and it didn't happen that way.. So...

Is there a chart, magic formula, prayer, chant etc.. that I can do to find out more?

Albert


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