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Vignetting
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===Optical vignetting=== This type of vignetting is caused by the physical dimensions of a multiple element lens. Rear elements of the lens are shaded by elements in front of them, which reduces the effective lens opening for off-axis incident light. The result is a gradual decrease in light intensity towards the image periphery. Optical vignetting is sensitive to the lens [[aperture]] and can often be cured by a reduction in aperture of 2β3 stops. (An ''increase'' in the [[F-number]].)
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