| 摘要 |
<p>A telescopic optical system that can be compact and lightweight is provided, and an optical apparatus including the telescopic optical system is also provided. A telescopic optical system 10, which is used in a telescope and other optical apparatus, includes the following optical systems arranged from an object side: an objective optical system 1; and an erecting optical system 2, which erects an image formed by the objective optical system 1, and the erecting optical system 2 includes a first reflection mirror 22, which is a first reflection member and has a reflection surface that reflects light from the objective optical system 1, a second reflection mirror 23, which is a second reflection member and has a reflection surface that reflects the light reflected off the first reflection mirror 22, and a roof prism 25, which is a third reflection member, has at least three surfaces including at least one roof surface, uses one of the surfaces as a light incident surface and another one of the surfaces as a light exiting surface, and causes the light reflected off the second reflection mirror 23 to be incident through the light incident surface, to be reflected off the surfaces, and then to exit through the light exiting surface.</p> |
