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How to Assess Noise

This section covers how we can assess noise in ways that are relevant to real photography.

Noise per pixel

When making a print, a 12.1MP D3 image needs about 1.42X more enlargement linearly than a 24.4MP D3x image. Image quality vis-a-vis noise is directly related to the enlargement size, and so comparing noise must be done at the same area.

The analogy here is scanning one square millimeter of 35mm film vs 1 square millimeters of 645 film, and then concluding that 645 film has identical resolution and grain. It does of course, but the frame as a whole needs less enlargement. Yet that is exactly what some DSLR noise comparisons with digital do: they compare the same number of pixels, representing different areas (magnifications).

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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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Canon 1Ds Mark III, ISO 3200, striation noise

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