EXCERPT page containing first few paragraphs. 2019-06-18 11:19:50
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The Nikon 19mm f/4E ED PC-E is essentially a rectilinear fisheye lens that covers a large medium-format size image area. Shifting captures an image area that is off-center. By combining these images, a much larger capture area is possible.
By taking a center image (shift control zeroed), a second image shifted fully 12mm and a 3rd image shifted 12mm in the opposite direction, the width or height of the frame can be extended by 24mm (12mm x 2) yielding in effect the following sensor sizes:
- 36mm X 48mm, aspect ratio of 4:3 / 3:4. (Leica S is 36 X 45mm)
- 60mm X 24mm, aspect ratio 2.5:1.
The key question is whether the lens performance holds up well enough for those extra capture pixels to be worth capturing. With nearly all shift lenses, the answer is a resounding “no” because image quality declines too much.
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