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The ability to measure an optical transfer function (OTF) with sufficient accuracy and speed at a practicable cost is a goal of high significance in the art of optical instrumentation. Just the confidence among designers and users that a measurement of the OTF in one laboratory, or on a specific set of equipment, could be reproduced reliably at another time and place would most certainly broaden the use of the OTF for the specification and proving of optical systems. Optical quality could then be generally specified not only in terms of geometric fidelity between image shape and object shape but also in terms of a fidelity of contrast between given points in object and corresponding points in image.
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