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Cognex Corp. - Smart Sensor 3-24 GIF LB
Photonics Dictionary

image splitting eyepiece

An eyepiece having a special prism arrangement linked to a micrometer screw to allow reading of the angular relations between the two prism segments to be varied. When the prism faces are parallel, two images are superimposed, and subsequent turning of the micrometer causes the images to move across each other.
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