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EXCERPT page containing first few paragraphs. 2021-12-04 02:53:17

Sigma 120-300mm f/2.8 DG OS HSM S

Aperture Series: Water Bottles (Canon 5DM3, 300mm)

The goal here is to assess control of secondary longitudinal chromatic aberration which tends to show up on out of focus high contrast areas or other transitional contrast areas.

Shooting details

The lens was on a tripod, and focused at 300mm. Shutter speeds ranged from 1/13 second at f/2.8 to 1.0 seconds at f/11. While watching in 10X Live View for any movement, a remote release was used in Mode 2 (zero vibration).

To avoid blur from motion, extreme caution is advised when shooting with long telephoto lenses. Like nearly all super teles (Canon, Nikon too), the tripod foot is poorly designed for stability, producing visible jiggling at the slightest provocation (a puff of wind). This is easily seen by entering magnified Live View. The weight and sturdiness of the tripod are only a minor factor by comparison. Long lens looking for stability use more elaborate support mechanisms.

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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.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Nikon or on Canon or on Pentax.

Aperture series 2.8, 4, 5.6, 8, 11 available in full article

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