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gptkb:Newtonian_Telescope
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gptkb:Reflector
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gptkb:Maksutov_camera
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meniscus corrector lens
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gptkb:Newtonian_telescope
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reflector
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gptkb:Maksutov-Cassegrain_Telescope
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spherical primary mirror
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gptkb:Zeiss_Sonnar_85mm_f/2.0
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gptkb:Sonnar
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gptkb:Newtonian_reflector_telescope
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open tube
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gptkb:Zeiss_Sonnar_180mm_f/2.8
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gptkb:Sonnar
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gptkb:Klevtsov–Cassegrain_telescope
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Cassegrain configuration
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gptkb:ETX_telescope_series
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gptkb:Maksutov-Cassegrain
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gptkb:Meade_16-inch_LX200
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catadioptric
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gptkb:Loxia_35mm_f/2
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9 elements in 6 groups
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gptkb:Nikon_Monarch_binoculars
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gptkb:Roof_prism
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gptkb:Meade_LX200_14-inch
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gptkb:Schmidt-Cassegrain
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gptkb:Meade_LX90_8-inch
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gptkb:Schmidt-Cassegrain
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gptkb:Distagon_lens
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retrofocus
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gptkb:Duomar_Lens
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twin lens
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gptkb:Grubb_12-inch_refractor
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achromatic doublet
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gptkb:Dobsonian_telescope
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gptkb:Newtonian_reflector
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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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secondary mirror (often aluminized spot on corrector)
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