EXCERPT page containing first few paragraphs. 2019-02-17 11:02:04
UA_SEARCH_BOT_null @ 22.214.171.124
This page uses a SpyderCHECKER® color checker card to evaluate the white balance and tint needed in mid-day sun for the Sigma 70mm f/2.8 DG Macro Art, using Photoshop/ACR raw file conversion.
The following process was followed to ensure the best possible neutrality of the grayscale (black to white) patches on the color card:
- Use click white balance as a starting point.
- Perform, twice, a 15 pixel Gaussian Blur. In Lab mode, check for neutral tint ('a' channel) and neutral color ('b' channel).
- Adjust color temperature and tint; repeat steps 2 and 3 until the best possible neutrality is achieved.
Evaluation: Mid-Day Sunlight, 500' elevation
An about $127 DataColor SpyderCHECKER was used for this evaluation. I use the clamshell version so I can safely carry it without damaging it. I do not use the calibration software as I have not been satisfied with the results versus the stock Adobe profiles.
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 7 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 28 megapixels filling up to 5K display, 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.