| 摘要 |
FIELD: optics. ^ SUBSTANCE: device has, mounted along beam path, main concave spherical mirror, correcting element, including two singular lenses of different grade glass with quasi-close in visible spectrum range dispersion coefficients, first of them is made in form of negative quasi-focal meniscus, directed by concave portion to observation object, and second one, negative, has mirror reflecting surface and is made of material with lesser refraction coefficient and three-lens isoplanatic compensator of non-axial aberrations, the last along beam path component of which is made in form of quasi-concentric meniscus, directed by concave portion to image plane. ^ EFFECT: better image quality, higher efficiency. ^ 3 cl, 3 dwg |
