Abstract
Abstract A modified version of the folded aplanatic Gregory telescope equipped with a spherical two-lens corrector is proposed for observations requiring a high signal-to-noise ratio. The basic telescope model has an aperture of 400 mm (f/3.0), its field of view is 3.°0, the linear obscuration is 0.12, and the distortion is less than 0.5%. The focal surface has a spherical shape, and achieving a plane field requires an increase in the number of lenses in the corrector. The images of stars in the integrated wavelength range 0.35–1.0 μm are close to the diffraction-limited ones (D 80 = 5.9–8.2 μm = 1.″0–1.″4). The system is free from direct background illumination, and both the lens corrector and the light detector are protected from cosmic particles.
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