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

Aperture Series: White Mountain Peak (Canon 5DM3, 300mm)

This is a rigorous (very demanding) test at infinity focus at 300mm. It confirms the symmetry issue seen with many other field images.

Atmospheric haze was a factor here through many miles of air; contrast was added via a tonal curve in order to compensate.

The lens was on a tripod, and zoomed to 300mm, optical stabilization disabled as it ought to be on a tripod. A remote release was used along with vibration-free Canon Mode II Live View exposure.

Shutter speeds ranged from 1/1000 second at f/2.8 to 1/160 second at f/11. Although care was taken, there is always some risk of movement at lower shutter speeds.

White Mountain Peak, 14,252' elevation

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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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