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In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange
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Cassegrain reflector - Wikipedia
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In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange
Telescopes Type of build Schmidt-Cassegrain | ASTROSHOP
TAL Telescopio Cassegrain C 150/1550 OTA
