EXCERPT page containing first few paragraphs. 2020-09-18 10:49:16
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Often a lens can be purpose built to test well at medium and far distances (gaming the naive “lab test” system very effectively), but it degrades significantly or even severely at close range. An example of this is the Nikon 58mm /1.4G, which exhibits a severe loss of contrast at close range. With macro lenses, the reverse can sometimes be true.
To understand the quality gradient of a lens, it’s important to check performance at a variety of distances; a top performing lens will deliver an image at its closest focusing distance that remains close to its best quality at medium and far distance.
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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.