EXCERPT page containing first few paragraphs. 2020-09-19 12:34:39
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The Sigma 18-35mm f/1.8 zoom on the Sigma SD1 Merrill offers a very high quality image for landscape style shooting but as with any lens, critical focus is required to obtain sharp results at wider apertures.
This scene is at focus near infinity, which is generally the most demanding scenario for autofocus systems as well as the lens optics; for the lens the slightest misalignment can show skew (asymmetry). Thus a test like this is highly revealing of everything.
Converted using these settings in Sigma Photo Pro v5.5.3. Use of +0.3 X3 Fill Light restored the “as remembered” brightness feeling to the image.
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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.
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