EXCERPT page containing first few paragraphs. 2021-04-11 20:00:37
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Rise = upward shift
Fall = downward shift
Shift = left or right shifting or a general reference to left/right shift or rise/falls
The Nikon 19mm f/4E PC-E actually shifts about 12.5mm in each direction, so that a 2-frame stitch yields a virtual sensor of 49mm in height along the short axis. Thus the Nikon D810 + Nikon 19mm f/4E PC-E offers a virtual sensor area of up to 36mm X 49mm (or 51mm X 24mm).
Finished stitched images made from combining two or three frames (maximum rise, centered, maximum fall) are about 7312 X 9988 = 73.0 megapixels, captured from a virtual sensor area of 49 X 36mm. That is slightly more than double the pixels of the 7360 X 4912 = 36 megapixel Nikon D810 sensor, due to the slightly more than 12mm shift in both directions (24mm wide + ~12.5mm + ~12.5mm = ~49mm).
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