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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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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.

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