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DLP® Discovery System Optics Application Note - page 23 / 38

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2510332 - February 2009

at the Nyquist (fundamental) frequency anywhere in the lens field at a single plane of best focus for the entire field. In addition, there should be no more than 20% difference between sagittal and tangential MTF at any field point (astigmatism) because there are many vertical and horizontal features in graphics display and the operator desires all of them to be in focus at the same time. These values are actual lens-performance minimum values or, equivalently, the 3-sigma tolerance design limits. Nominal design MTF minimums are 10% to 20% higher, depending on the manufacturers’ processes and design sensitivities. It is important to include the DMD device parallelism tolerance as part of the lens tolerances when optimizing the design (see 4.3.2 for reference).

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