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Optical baffle is an opto-mechanical construction designed to block light from a source shining into the front of a optical system and reaching the image as unwanted light.

Principles
Optical systems which have stringent requirements on stray light levels often need optical baffles. There are many designs, depending on the desired goals. Generic optical baffle designs and their advantages for stray light control can be classified as reflective or refractive; reimaging and nonreimaging systems.