EXCERPT page containing first few paragraphs. 2021-12-04 14:23:40
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Field illumination (light falloff and vignetting) is generally excellent for a 17mm lens. Wide open, falloff is pronounced at full shift, improving substantially at f/5.6. By f/8 light falloff is very reasonable. New sensor designs might reduce these effects.
Aperture f/11 is the best bet for minimizing falloff, and indeed f/11 or f/16 is required anyway in order to sharpen up the outer zones when fully shifted. So as a practical matter, vignetting is not really of concern.
Light falloff in the long axis
The Hoover Tower example is at approximately 10.5mm of rise (out of 12mm maximum).
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