Imagery: Auto - Large Table of Contents

EXCERPT page containing first few paragraphs. 2021-09-26 03:17:13

Sigma 35/1.4 DG HSM for Canon

Compared vs Canon 35mm f/1.4L (Dolls, Canon 5DM3)

Shot with Canon 5D Mark III.

This comparison was exacting. A nodal slider (camera mounted on plate that can be moved linearly) was used to match focus to within 1mm at f/1.4; the engraved 1mm marks allow precise focus adjustment (shoot, check, make exact adjustment, focus bracketing in 1mm increments).

Actual focal length being wider-angle for the Canon 35/1.4L, it was moved just a little closer to the scene, but because the nodal slider was used, the “angle of attack” was identical, and not very much different in any case.

The camera was pointed down slightly, so that the nominal plane of focus slices roughly through the top of the color patches down through the central doll’s eyes and through the knee area of the central doll. Depth of field is most certainly involved here, by intention.

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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].
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  • 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.

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Variation in brightness — Canon auto-lens tweak

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