Response to Thin Negatives from Film Speed Test

Reading the density of uniform negative won't always give an accurate EI unless all you take are photos of uniform gray objects. All lenses have some haze which reduces contrast, then there's flare and internal lens and body reflections, all affecting the shadows most. Try taking a photo of a black object (like a card covered with black felt) under the conditions you want to use the EI in a "normal" scene. The image of the object on the neg must of course be larger than the aperture of the densitometer.

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