EXCERPT page containing first few paragraphs. 2021-12-04 02:08:09
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This f/2.8 - f/16 aperture series was shot to explore the background blur characteristics at 70mm at close range— a tight head and shoulders portrait.
This is the same image used for the correction of color fringing example.
Bokeh is quite pleasing centrally, but becomes less smooth towards the edges and corners. For a portrait, this area would likely be well out of focus, and so that would matter little.
Also of note is a typical off-center effect when wide open in which the edges and corners appear to be somewhat sharper in out of focus areas than more central areas; this is in part due to a smaller effective aperture away from center (optical vignetting). This effect diminishes with stopping down.
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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.