Posts Tagged ‘lenses’


A lens that comprises two elements glued together in order to reduce chromatic aberration. One of the elements is made from crown glass and the other from flint glass. They work well if the light is travelling parallel to the lens’s axis but performance is worse if it is not, in which case multi-element lenses should be employed.

Chromatic Aberration

A defect of a lens that creates a fringe of colour round an object. It is caused by the fact that different wavelengths of light are refracted by different amounts.

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