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Cassegrain reflector - Wikipedia
The Cassegrain telescope [15] | Download Scientific Diagram
A Cassegrain telescope uses two mirrors as shown in the above figure. Such a telescope is built with the mirrors $20mm$ apart. If the radius of curvature of the large mirror is
Two-mirror telescopes: Cassegrain, Gregorian and variants
Cassegrain reflector | astronomical instrument | Britannica
Schmidt–Cassegrain telescope - Wikipedia
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76MM (3") DIA MAKSUTOV-CASSEGRAIN TELESCOPE LENS SET
An example Cassegrain telescope system with a primary mirror at F/1.2,... | Download Scientific Diagram
Two-mirror telescopes: Cassegrain, Gregorian and variants
Schmidt-Cassegrain Design — Starizona
No. 26 - 2008: IRTF to Get New Secondary Mirror
Design of a high-precision, 0.5 m aperture Cassegrain collimator