EXCERPT page containing first few paragraphs. 2019-02-19 22:43:12
UA_SEARCH_BOT_null @ 188.8.131.52
Sony A7R II, firwmare version 3.1.
This finely detailed scene was shot about a dozen times to check and cross-check, optimizing the zone of focus to intersect the key areas as optimally as possible. A number of behaviors became clear:
- Something around 1mm of focus difference at this ~1 meter shooting range makes a significant difference in sharpness at any given area.
- Focusing at 12.5X suggests that “through MTF” differs for fine detail versus coarse details. That is to say: peak MTF for coarse and medium structures has a slightly different best focus position than peak MTF for fine structures. This could be observed firsthand when experimentally focusing on the resolution bars.
- The Sony 85/1.4 is sharp into the corners wide open. But the chances of getting the zone of focus within 1mm at center, mid zones and corners is just about nil, even by arranging objects to “fit” (as here). Add in focus shift and it’s a crap shoot.
- In outer areas of the frame, there is a pronounced focus shift. This explains my consternation in trying to compare with the Batis 85/1.8.
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.