EXCERPT page containing first few paragraphs. 2022-01-25 15:42:05
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The Canon EF 20mm f/2.8 USM is a fairly large lens, but also fairly light at just about one pound with lens shade (not supplied with the lens).
Prime lenses (fixed focal length) can be better performers than zooms because they can be optimized for just one focal length. That is, if they are optimized, as opposed to a lackluster design.
The field test on the following page shows that the 20/2.8 delivers murky somewhat better results than the Canon EF 16-35mm f/2.8L II, depending on where in the frame one compares, and the focusing distance.
Performance of this lens is marginal compared to the Zeiss 21mm f/2.8 Distagon, as might be expected, since it costs 1/4 the price.
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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.
- 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.