COLOR-CORRECTED OPTICAL SYSTEM, IN PARTICULAR A COLOR-CORRECTED ENDOSCOPE

摘要

An optical device includes an elongated tube configured for insertion into a body and optical members located in the tube, The optical members are configured to have an optical invariant-to -clear aperture semi-diameter ratio greater than about 0.05 and an optical path difference less than about a value of the optical invariant divided by at least 250 times a midrange wavelength in a spectral range from about 435.8 nm to about 656.3 ran, and are preferably formed of an extraordinary dispersion optical material. A method includes conducting polychromatic light through at least one optical member located in an elongated tube configured for insertion into a body, where the optical members have an optical invariant-to-clear aperture semi-diameter ratio greater than about 0.05 and an optical path difference less than about a value of an optical invariant divided by at least 250 times the midrange wavelength from about 435.8 to about 656.3 nm.