| 摘要 |
FIELD: optical instrument engineering, applicable in various optical systems, the infrared systems inclusive. ^ SUBSTANCE: the four-element telephoto lens has two components, the first of which is a positive one and consists in its turn of three sticked lenses - of positive and negative menisci turned by the convexity to the object, and a flat-convex lens turned by the convexity to the object, and the second component - a flat-concave lens turned by the concavity to the object. The relations indicated in the claim are realized in the telephoto lens. ^ EFFECT: enhanced focal length and the relative aperture, simplified construction and enhanced adaptability to manufacture at a high quality of image. ^ 3 cl, 1 dwg |
