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A design of reflecting optical telescope yielding good images over a field of view of 5° or more. It is a modified version of the Paul-Baker system. The primary mirror contains a hole, the size of which is 60 per cent of the total diameter and in which lies the focal plane. The shapes of all three mirrors depart substantially from the nearest paraboloid or sphere. The design's advantages are that the telescope is much more compact than a Schmidt camera, there are no ghost images of the type caused by internal reflections in the corrector lens of a Schmidt camera, and it should be possible to build a telescope to this design larger than any existing Schmidt camera.
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