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Effect of aperture modulation on the MTF of a binocular objective having off-axis aberrations.

Aperture modulation effects have been investigated in a Korean binocular objective lens in isolation from the rest of the system. The off-axis aberrations are derived from the design data. The MTFs are measured for the same modulated aperture and compared by the same method, in the presence of off-axis aberrations, as the rotationally symmetric aberrations presented in the previous paper [Appl. Opt. 22, 1812 (1983)]. The MTF of the lens was found to be improved by proper aperture modulation.