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EXCERPT page containing first few paragraphs. 2023-03-25 04:29:20

Pentax DA HD Limited 15mm f/4 ED

Aperture Series: Sidelit Barn (Pentax K3)

Pentax K3, shake reduction off.

This aperture series evaluate the Pentax HD Limited 15mm f/4 on a real-world subject that includes front-to-back detail to assess sharpness and to rule out field curvature.

When assessing lens sharpness, it is critical to rule out erroneous conclusions that might occur with a flat target. For example, a lens can appear to be soft at the corners and yet actually be very sharp, but at a slightly different distance. The subject chosen allows a correct evaluation to be made, by having both foreground and background detail available to assess any field curvature behavior.

Resolution needed from the lens

The 24-megapixel APS-C sensor in the Pentax K3 has no anti-aliasing filter, and thus is capable of resolving a very high level of detail.

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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 4, 5.6, 8, 11, 16 available in full article

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