| http://www.w3.org/ns/prov#value | - The system of FIGS. 8-14 has essentially the characteristics previously described including a resolution at + fifteen degree converging marginal rays 51, 52, FIG. 3, of forty line pairs per millimeter, and a depth of focus of about twenty-five millimeters, and a close-in optimum focal plane located about six millimeters in front of the front surface of window 34.
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