Telescope

A telescope comprising:

• a primary minor for imaging an astronomical object;
• a compensation optical system for compensating for an aberration produced by the primary mirror;
• an image pickup element for receiving light of a formed image, the image pickup element configured to tilt relative to the compensation optical system and the primary minor in response to tilting of the telescope;
• a lens barrel for integrally housing and supporting the compensation optical system and the image pickup element such that adjustment of an attitude of the lens barrel changes an angle of an optical axis of the compensation optical system and an angle of the image pickup element with respect to an optical axis of the primary minor;
• and
• an aberration compensation mechanism for adjusting an attitude of the lens barrel to compensate for an aberration resulting from a change in relative tilt between the compensation optical system and the image pickup element caused when the telescope is tilted to observe an astronomical object other than the zenith.

A system placed inside a telescope having a concave minor reflecting light from an object, the system comprising:

• an image pickup element receiving light from the concave mirror;
• a compensation optical system guiding light from the concave mirror to the image pickup element, wherein the image pickup element is configured to tilt relative to the compensation optical system and the concave minor in response to tilting of the telescope;
• a lens barrel integrally holding the image pickup element and the compensation optical system;
• and
• a drive mechanism driving the lens barrel to change an angle of an optical axis of the compensation optical system and an angle of the image pickup element with respect to an optical axis of the concave mirror to compensate for an aberration resulting from a change in relative tilt between the compensation optical system and the image pickup element.