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gptkb:Klevtsov–Cassegrain_telescope
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Cassegrain configuration
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gptkb:Fujinon_XF_lenses
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aspherical elements (select models)
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gptkb:Meade_LX200_14-inch
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gptkb:Schmidt-Cassegrain
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gptkb:Heliar_lenses
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symmetrical
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gptkb:Zeiss_refractor
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apochromatic
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gptkb:Zeiss_Sonnar_180mm_f/2.8
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gptkb:Sonnar
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gptkb:Zeiss_refractor
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achromatic
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gptkb:Celestron_CPC_Deluxe
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catadioptric
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gptkb:Celestron_25-inch_Newtonian_reflector
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Newtonian
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gptkb:Schwarzschild_telescope
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anastigmatic
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gptkb:Celestron_14"_SCT
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gptkb:Schmidt-Cassegrain
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gptkb:Newtonian_reflector_telescope
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open tube
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gptkb:Nikon_Monarch_binoculars
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gptkb:Roof_prism
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gptkb:Cooke_refractor
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achromatic doublet
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gptkb:Schneider-Kreuznach_Xenar_38mm_f/2.8
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Tessar-type
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gptkb:Steinheil_Cassar_lens
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3 elements in 3 groups
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gptkb:0.61_m_Cassegrain_Telescope
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gptkb:Cassegrain_reflector
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gptkb:Zeiss_Sonnar_85mm_f/2.0
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gptkb:Sonnar
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gptkb:Ritchey-Chrétien_telescope
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gptkb:Cassegrain_reflector
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gptkb:Duomar_Lens
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twin lens
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