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gptkb:Steinheil_Cassar_lens
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3 elements in 3 groups
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gptkb:Klevtsov–Cassegrain_telescope
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Cassegrain configuration
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gptkb:Newtonian_telescope
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reflector
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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:Meade_16-inch_LX200
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catadioptric
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gptkb:Classic_Heliar
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gptkb:Heliar
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gptkb:Zeiss_Sonnar_85mm_f/2.0
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gptkb:Sonnar
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gptkb:Meade_LX200_14-inch
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gptkb:Schmidt-Cassegrain
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gptkb:Zeiss_refractor
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apochromatic
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gptkb:Nikon_Monarch_binoculars
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gptkb:Roof_prism
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gptkb:Loxia_50mm_f/2
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Planar
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gptkb:ETX_telescope_series
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refractor (some models)
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gptkb:Celestron_14"_SCT
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gptkb:Schmidt-Cassegrain
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gptkb:Maksutov-Cassegrain_Telescope
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spherical primary mirror
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gptkb:Fujinon_XF_lenses
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ED glass (select models)
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gptkb:Meade_LX90_8-inch
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gptkb:Schmidt-Cassegrain
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gptkb:ETX_telescope_series
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gptkb:Maksutov-Cassegrain
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gptkb:Newtonian_reflector
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astronomer
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gptkb:Steinheil_Orthostigmat_lens
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symmetrical
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