A Twin Reflecting Astrograph
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.
Instrumentation and Research Programmes for Small Telescopes
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