| 摘要 |
A photogrammetric optical apparatus for obtaining information from a stereo pair of images (1). Light rays from images (1) are directed to a region (23). Reference mark light ray generating means (13) provide reference mark light rays which are also directed to region (23). All of the light rays are collimated in region (23). A telescope (61, 63) is provided to receive light rays whose direction are changed orthogonally by combined prisms and beam splitters (76) which are within region (23). The arrangement is such that the light rays from reference mark generating means (13) is factory adjusted for collimated light output and this forces all light rays in region (23) to be collimated regardless of normal operator focus adjustments. The arrangement permits a compact and lightweight but very stable precision system to be produced. |
