Could somebody explain this to me? I understand what it is, increasing exposure times as film does not react to light in the way it was intended to at longer exposures. I looked at Ilford's chart for calculating this, but I dont understand it. Is it just a case of doubling the stop by what it would normally be? I am planning on shooting 5x4 film at quite a slow speed, so I might have to do longer exposures to what I normally do, depending on the circumstance.
Thank You
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