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physical object > artifact > device > instrument > optical device > wavefront modifier > focal reducer

focal reducer comparison table

Subject	has wavefront modification	has definition	is a kind of
wavefront modifier	shape, polarization or wavelength	A device which modifies the wavefront shape, polarization or wavelength	optical device
focal reducer	shape	An optical component or system for changing the image scale of a telescope to achieve a better match between the seeing disk and the pixel size. See optical matching.	wavefront modifier

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