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Frame-to-Frame Alignment

When a shift lens is shifted, it is desirable (for stitching in particular) that the lens maintain perfect horizontal or vertical tracking so that the edges of the shifted frames match the edges of the unshifted frame (and each other) exactly.  Perfect alignment is unrealistic on a camera like the Nikon D2X, with its 5 micron pixels, so misalignment is a matter of degree.

Checking this kind of misalignment is straightforward—shoot the lens unshifted, then shoot 4 additional frames, one for each direction of shift.  Then, in Adobe Photoshop or similar program, match up the images pixel-for-pixel and observe any mismatched edges.  (This test does assume that the subject is far enough away to eliminate parallax, which would make it impossible to match the images perfectly.  Parallax, and how to eliminate it, are discussed in a forthcoming diglloyd article on shift-lens stitching).

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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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