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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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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
- Make better images by learning how to get the best results right away.
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- Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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Canon 1Ds Mark III, ISO 3200, striation noise