EXCERPT page containing first few paragraphs. 2019-03-20 11:24:15
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When making composite stitched images with the Nikon 19/4E PC-E (see the Alpine Creek example and others), besides the challenge of optimized focus given its field curvature and focus shift behaviors, the key challenge is avoiding parallax.
When shifting, the front of the lens moves. That is a Big Deal because that movement shifts the entrance pupil, which determines the angle to the subject and thus creates parallax between frames at different shift positions: shifting the lens translates the position of the entrance pupil by the amount of the shift. Thus a 12.5mm shift in one direction and a 12.5mm shift in the other add up to a 25mm of dislocation of the entrance pupil, which creates substantial parallax at close range. Parallax is problematic for shift-lens stitching just as it is for rotational stitching.
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