This page investigates performance of the quarter tones (near black), an area of performance rarely explored yet extremely useful in any dynamic scene, or with underexposed images. While this issue applies to any ISO, it should be of particular concern for anyone seeking the absolute best image quality, which means using low ISO values. Please see Low vs High ISO for more about this important area of performance.
Near-black performance is also highly relevant to current DSLR features like Nikon’x Noise Amplified for more.and Canon’s . See
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After applying Shadows/Highlights as detailed below