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Aubert Blende
health.	Aubert diaphragm
Aubert-Blende =, -n
opt.	cat's-eye aperture (vignetting the edge rays by progressively reducing the aperture's radial size as the off-axis image angle increases); cat's-eye stop (vignetting the edge rays by progressively reducing the aperture's radial size as the off-axis image angle increases); cat's-eye diaphragm (vignetting the edge rays by progressively reducing the aperture's radial size as the off-axis image angle increases)