EXCERPT page containing first few paragraphs. 2021-04-15 00:06:02
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Apparent light fall-off is a combination of optical characteristics, aperture used, and sensor technology. Both brightness and color are at play.
Optical vignetting is 2+ stops wide open on full-frame cameras, very similar to the 18/3.5 Distagon wide open. However, remember that wide open is f/2.8 for the 21/2.8 Distagon vs f/3.5 for the 18/3.5 Distagon. Stopped down to f/3.5, the 21/2.8 Distagon provides much more even illumination than the 18/3.5 Distagon.
Stopping down to f/5.6 reduces vignetting to a level that should be of little concern; software can be used if perfectly even illumination is a requirement. Apertures f/8 and f/11 offer minimal or no improvement over f/5.6.
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