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Relative uniformity of illumination

Image vignetting and shading, Mechanical vignetting, Cos4 vignetting, Sensor shading

All images from lenses suffer from intensity decrease from the centre to the edge of the image. As this can affect the suitability of a lens for an application, it is necessary to examine the performance of a lens concerning this behaviour, which is known as vignetting.

As the following images show, the effects of vignetting can be pronounced, and care must be taken when choosing the optimum lens solution