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gptkb:Schmidt_telescope
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catadioptric
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gptkb:Cooke_refractor
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achromatic doublet
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gptkb:Fujinon_XF_lenses
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aspherical elements (select models)
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gptkb:Maksutov_camera
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spherical mirror
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gptkb:Celestron_14"_SCT
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gptkb:Schmidt-Cassegrain
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gptkb:Meade_LX200_14-inch
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gptkb:Schmidt-Cassegrain
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gptkb:Duomar_Lens
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twin lens
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gptkb:ETX_telescope_series
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gptkb:Maksutov-Cassegrain
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gptkb:Zeiss_refractor
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apochromatic
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gptkb:Newtonian_telescope
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reflector
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gptkb:Klevtsov–Cassegrain_telescope
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Cassegrain configuration
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gptkb:Schneider-Kreuznach_Xenar_38mm_f/2.8
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Tessar-type
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gptkb:ETX_telescope_series
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refractor (some models)
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gptkb:Fujinon_XF_lenses
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ED glass (select models)
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gptkb:Zeiss_Sonnar_180mm_f/2.8
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gptkb:Sonnar
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gptkb:Meade_LX90_8-inch
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gptkb:Schmidt-Cassegrain
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gptkb:Classic_Heliar
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gptkb:Heliar
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gptkb:Newtonian_reflector
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gptkb:astronomer
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gptkb:Maksutov_camera
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meniscus corrector lens
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gptkb:Maksutov-Cassegrain_Telescope
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spherical primary mirror
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