EXCERPT page containing first few paragraphs. 2020-09-19 10:50:25
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This scene examines the Sigma 24mm f/1.4 DG HSM Art using focus that was intentionally placed at a medium distance, leaving both the background and foreground slightly out of focus, thus eliminating any doubt as to peak imaging performance wide open, and showing the zone of sharpness across the frame and near to far. The scene is excellent for assessing field curvature, the point spread function, and chromatic aberrations.
The limits of the Sigma 24mm f/1.4 DG HSM Art on a 36-megapixel sensor (Nikon D810), are clearly shown here. As a practical benefit, the scene reveals just how much stopping down for image quality is warranted for this kind of scene (depth of field requirements aside).
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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.
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- 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.