EN: Peripheral illumination
The brightness of a lens is determined by the F number, but this value only indicates the brightness at the optical axis position, i.e., at the center of the image. The brightness (image surface illuminance) at the edge of the image is called peripheral illumination and is expressed as a percent (%) of the amount of illumination at the image center. Peripheral illumination is affected by lens vignetting and the cos4 (cosine 4) law and is inevitably lower than the center of the image.
Canon glossary EU
Any external hardware device connected or attached to computer, e.g. printer, scanner.
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The name used to describe any accessories that connect to a computer such as card reader, printer or scanner. .
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Light falloff, at its worst at maximum lens aperture, where light is less at image edges than at the center. Peripheral Illumination Correction function in some EOS DSLRs uses power of image processor to maintain corner to corner evenness of illumination in JPEG images and movie clips, even shooting wide open with zoom lens.
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