EXCERPT page containing first few paragraphs. 2020-02-21 22:55:06
UA_SEARCH_BOT_null @ 184.108.40.206
This series with 12mm 'fall' (downward shift) along the short axis assesses the ability of the lens to deliver an image with strong detail by stopping down—tilt was not used in part because it would have been problematic for sharpening other desirable areas.
The main behavior seen here is a pronounced rearward focus shift which the series shows to be problematic. Other examples of focus shift in wide angles:
- Sigma 12-24mm f/4 DG HSM Art @ 14mm: Two Aspen
- Focus Shift: Nikon 14-24 Across The Frame, Focus f/2.8 vs f/5.6 (Cabin)
- Zeiss Milvus 18mm f/2.8 Aperture Series: Frosty Picnic Table (Nikon D810)
Article continues for subscribers...
Diglloyd Advanced DSLR is by yearly subscription. Subscribe now for about 16 cents a day ($60/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for only 68 cents a day ($249.95)!
Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
- Make better images by learning how to get the best results right away.
- Save money by choosing the right lens for your needs the first time, particularly some of the new Sigma Art lenses vs Nikon and Canon.
- Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops [past 2 years or so].
- 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.