Abstract
Previous researches(1)(2)disclosed two aperture modulation effects - a spatial frequency filtering effect and an aberration campansation effect. The spatial frequency filtering effect was found when aperture modulation was used with an aberration free system, and aberration compansation effect when aperture modulation was used with the large aberrations. The filtering effect was found by computing theoretical MTF, and compansation effect by computing the MTF from design data. Another important discovery was that the MTF could be improved by proper aperture modulation(3)(4). This discovery was made by measuring the MTF of a binocular objective experimentally. In this work, a double annular aperture type catadioptric system (DAA), which would have those two modulation effects, was designed to be sure the possibility of its practical use. The DAA system is composed of an outer annular aperture type catadioptric system and an inner small circular full aperture type refracting system. The ray aberration and MTF were compared those of a full aperture type refracting system and an annular aperture type catadioptric system. In this comparison, the effective f-number and the focal lengths of the three systems were the same.© (1987) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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