EXCERPT page containing first few paragraphs. 2019-05-25 11:16:57
UA_SEARCH_BOT_null @ 18.104.22.168
Adobe Camera Raw (ACR) version 8.3 (141) maintains an undesirable behavior found in previous versions of ACR: it silently corrects for distortion and chromatic aberration with some cameras (and likely for other things too). Perhaps it is responding to some EXIF flag specified by a manufacturer stating “always correct this lens”?
Such auto corrections are inappropriate to the raw format, and have been mostly confined to consumer-grade cameras. Moreover correcting for lateral chromatic aberration can add chromatic aberration if the lens deviates from the expected (by being slightly off, for example)!
This example shows the behavior, including the loss of field of view with the auto correction of distortion. The image also appears rather soft at the edges (everywhere), and this almost certainly has some contribution from pixel-resampling and stretching to un-distort.
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.