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gptkb:50-cm_Zeiss_Cassegrain
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gptkb:Cassegrain
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gptkb:Newtonian_Telescope
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gptkb:Reflector
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gptkb:Maksutov-Cassegrain_Telescope
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meniscus corrector lens
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gptkb:Biogon_lens
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symmetrical
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gptkb:Fujinon_XF_lenses
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ED glass (select models)
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gptkb:Schwarzschild_telescope
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anastigmatic
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gptkb:Zeiss_refractor
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apochromatic
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gptkb:Schneider-Kreuznach_Xenar_38mm_f/2.8
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Tessar-type
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gptkb:Klevtsov–Cassegrain_telescope
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Cassegrain configuration
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gptkb:Newtonian_reflector_telescope
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open tube
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gptkb:Jupiter-3
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Sonnar-type
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gptkb:ETX_telescope_series
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refractor (some models)
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gptkb:Jupiter-8
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Sonnar-type
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gptkb:Schmidt_telescope
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catadioptric
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gptkb:Classic_Heliar
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gptkb:Heliar
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gptkb:Maksutov-Cassegrain_Telescope
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spherical primary mirror
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gptkb:Celestron_14"_SCT
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gptkb:Schmidt-Cassegrain
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gptkb:Meade_16-inch_LX200
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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:Cooke_refractor
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achromatic doublet
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