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EXCERPT page containing first few paragraphs. 2023-03-25 04:21:01

Pentax DA HD Limited 40mm f/2.8

Aperture Series: Waterfall and Backlit Mountains(Pentax K3)

Pentax K3, shake reduction off.

This aperture series evaluate the Pentax HD Limited 40mm f/2.8 on a real-world distant landscape subject that in particular shows us across the frame sharpness, and the effects of focus shift on such a scene.

Lundy Canyon waterfall and mountains

The lens shade is not adequate to shade the lens when the sun is just outside the frame because sunlight grazes the front elemen. But this is true for lenses in general; nothing short of specialized rectangular lens shades can restrict the entry of light perfectly.

The lens was shaded with a hand as well as could be but the sun was just above the frame and this was a bit hit and miss, with multiple attempts needed to avoid the hand in the image (even so, some discoloration is see in the sky at f/2.8). The f/2.8 frame shows apparent veiling veiling flare near bottom, but this might also be at least in part water mist illuminate by the sun.

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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 available in full article

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