| 摘要 |
The lens (objective) 3 and the eyepiece 2 are equiconvex and identical. The righting system is composed of two prisms 14, 15 separated by a field diaphragm 16 inclined at 45 DEG to the axis 10. The righting system is bounded by two faces 17 and 21 which are perpendicular to the axis 10. <IMAGE>
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