EXCERPT page containing first few paragraphs. 2023-03-25 04:37:31
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2.8 STM (MTB, Canon 5DM3)

Shot with the Canon 5D Mark III at ISO 100.

The EF 24-70mm f/2.8L II used here was one of the top 5% of around 80 lenses tested by LensRentals.com. However, this sample is different than the one shot in the 2012 review pages and thus might not perform the same (but my testing at swap-time showed it to be as good as the other).
The EF 24-70mm f/4L IS was brand-new out of the box.
The EF 40mm f/2.8 STM is a personal favorite pancake lens which has seen light use for a few months.

Focusing was done using 10X Live View and contrast detect autofocus, confirmed by eye as spot-on (Canon’s CDAF is excellent). The f/4 aperture of the 24-70/4L II does make precise decisions on pinpoint focus that much more difficult by eye, so CDAF is probably a better choice for it always.

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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.

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Canon EF 24-70/2.8L II
Canon EF 24-70/4L IS
EF 40mm f/2.8 STM