EXCERPT page containing first few paragraphs. 2019-05-19 16:54:37
UA_SEARCH_BOT_null @ 220.127.116.11
Obvious noise at ISO 100 on a 24 megapixel sensor is unexpected and very disappointing, but that’s exactly what I found with the Sony A9 without even having to go looking—one of the first few one-off shots I made.
I noticed some unexpected streaking in an image with a good exposure at ISO 100. The red channel is overlaid with horizontal lines/streaks in 12-pixel-high bands. Pattern noise is disturbing in any case, but to have it at ISO 100 with a good exposure is a huge negative for any camera, high speed shooter or not.
Possible diagnosis: the high-speed readout of the A9 sensor does not read out groups of rows evenly; there is some difference in gain between the rows. The pattern noise repeats in row groups that are 12 pixels high. Whether these row groups change in size with shutter speed is an open question as this was written.
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.