EXCERPT page containing first few paragraphs. 2019-10-18 18:18:52
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The strong contrasts and and background objects along with relatively uniform subject matter across the frame from left to right yield insights into the imaging quality of the Sigma 50/1.4A including sharpness, bokeh, color aberrations and other aberrations and any propensity to focus shift or field curvature. The subject is distant enough that it can be called an infinity focus shot (focus was on the prominent tree at left).
The lens was shaded from direct sunlight, so this is not a flare test.
Image quality is strikingly clear wide open at f/1.4, showing a very low level of secondary color errors and no visible hazing from spherical aberration or longitudinal chromatic aberration. The near absence of such optical aberrations accounts for the striking clarity.
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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.
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