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We measured the modulation transfer function ͑MTF͒ of a lens in the visible region using a random test target generated on a computer screen. This is a simple method to determine the entire MTF curve in one measurement. The lens was obscured by several masks so that the measurements could be compared with the theoretically calculated MTF. Excellent agreement was obtained. Measurement noise was reduced by use of a large number of targets generated on the screen.doi:10.1364/ao.38.000679 pmid:18305663 fatcat:ekreiui6tzgelcomnyyyfizsge