A Twin Reflecting Astrograph
Abstract
A newly developed catadioptric optical system and a modified yoke-type equatorial mounting were designed and constructed. An optical system consisting of a hyperbolic mirror and a simple lens corrector was designed featuring a wide field and a small focal ratio. The reflecting system, which is 30 cm in aperture and 113 cm in focal length, has an unvignetted flat field of 3° in diameter. The image quality at the field margin is 20 μm in the wavelength region of 380 - 680 nm.
- Publication:
-
Instrumentation and Research Programmes for Small Telescopes
- Pub Date:
- 1986
- Bibcode:
- 1986IAUS..118..113T