D & G is pleased to offer Classical Cassegrain optics and complete tube assemblies. Many Cassegrain telescopes do not perform well because of the high degree of optical quality necessary to achieve diffraction-limited performance. A relatively large central obstruction necessitates the most precise optics for superior resolution. Each set of optics is hand figured, diffraction-limited and quaranteed to equal or exceed the performance of any obtainable at any cost. A working unit is available here in PA for viewing to all interested parties.
Tube Asembly Includes
20" F/15 Classical Cassegrain Tube Assembly………..$19,990.00
20" F/15 Classical Cassegrain Optic set……..………..$11,990.00
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