EXCERPT page containing first few paragraphs. 2018-04-23 08:39:21
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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)
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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.
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- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
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