Dove Prisms

TECHSPEC® Dove Prisms have an unusual and fascinating characteristic. If you look through the prism and rotate it around a longitudinal axis, the image rotates through twice the angle through which the dove prism itself rotates. In this use, with light incident on either of the smaller diagonal surfaces, light is reflected off the bottom surface, and the image inverted, allowing both inversion of the image, as well as rotation. Dove prisms can also be used as retroreflectors, when light is incident off the longest face.  For optimal performance, use dove prisms with collimated light. The top surface of each dove prism is ground, and the longest length (specified by dimension B) features an unbeveled sharp edge.