EXCERPT page containing first few paragraphs. 2021-04-11 18:53:41
UA_SEARCH_BOT_null @ 220.127.116.11
ISO and noise is a complicated subject. For starters, ISO ratings can vary by camera significantly for the same resulting brightness of image. There can also be small exposure variations (aperture and shutter speed accuracy).
But the most important aspect of digital camera noise behavior is an odd failure to assess noise as it ought to be properly assessed: not on a per pixel basis but on an image quality basis. The appearance of noise depends on the character along with its magnitude, and the degree of enlargement:
- Character and magnitude—is the noise nicely random (film like)? Or perhaps does it show patterns or streaking or an overall color cast and/or loss of black level? The human eye is good at picking out various defects. Numeric assessments of noise are silly in this regard, skipping right past the pattern noise issue. More noise that is nicely random is far preferable to pattern noise.
- Enlargement factor—a 36-megapixel image will be enlarged to a lesser degree than a 12-megapixel image (pick any size print). Context-dropping by examining per-pixel noise without regard to enlargement factor has no meaningful basis in reality. All that matters is the appearance of the image at any specified size, whether in print or on screen. And that depends on the enlargement factor.
Article continues for subscribers...
Diglloyd Guide to Mirrorless is by yearly subscription. Subscribe now for about 25 cents a day ($90/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for only 68 cents a day ($249.95)!
Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
- Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
- Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
- Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and processing parameters are discussed and shown.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops.
- 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.
Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Sony.