Abstract
This paper presents the optical layouts and calculated characteristics of compact fast mirror–lens
objectives with an entrance aperture of 500 mm, an f number of 1.2, and an angular field
of 1.5° for operation in the ranges 1.8–2.6 and 3.2–4.2 mm. The objectives are about 430 and
460 mm long. Estimates are made of how the circle of confusion is affected by deformation
of the entrance window and the secondary mirror under the action of its own weight, as well as
by temperature changes of the elements of the objectives in the interval from 250 to 150 °C.
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