| 摘要 |
FIELD: aerial photography. SUBSTANCE: telephoto lens has two groups of lenses. The first group has five lenses arranged along beam path : the first lens is biconvex, the second one -biconcave, the third one is biconvex, the fourth one is biconcave, and the fifth one is positive menisci turned with its concavity to image. The second lens group has single biconcave and biconvex lenses. EFFECT: improved resolution. |
