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Nikon D810
Nikon 19mm f/4E ED PC-E

Aperture Series: Frosty Wood Round: Tilt and Focus Shift (Nikon D810)

This dual series with with lens tilt shows two aperture series with the same tilt but at different focus positions: one without compensation for focus shift, and one with compensation for focus shift. The pairing makes for a graphic demonstration of just 'insane' focus shift can be: I don’t consider an optimal compromise of this degree acceptable under any circumstances for a tilt/shift lens.

Tilt is in theory an outstanding feature in that it can evade the limitations on depth of field, but when one also has to deal with focus shift, its usefulness drops considerably: it is hard enough to fine-tune the amount of tilt, to which image sharpness is highly sensitive, while having to deal with the optical design idiocy of a strong focus shift to complicate matters. A “good” lens is one that is sharp and predictable, not one that has to be second-guessed, or compensated for—the risk of error goes way, way up when having to compensate for focus shift.

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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.

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