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gptkb:Componon-S_lens
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6 elements in 4 groups
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gptkb:Maksutov_camera
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spherical mirror
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gptkb:Biogon_lens
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symmetrical
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gptkb:Newtonian_telescope
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reflector
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gptkb:Loxia_50mm_f/2
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Planar
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gptkb:Newtonian_reflector_telescope
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open tube
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gptkb:Fujinon_XF_lenses
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aspherical elements (select models)
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gptkb:ETX_telescope_series
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gptkb:Maksutov-Cassegrain
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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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meniscus corrector lens
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gptkb:Meade_LX200_14-inch
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gptkb:Schmidt-Cassegrain
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gptkb:Celestron_CPC_Deluxe
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catadioptric
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gptkb:Grubb_12-inch_refractor
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achromatic doublet
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gptkb:Duomar_Lens
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twin lens
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gptkb:Maksutov_camera
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meniscus corrector lens
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gptkb:Schneider-Kreuznach_Xenar_38mm_f/2.8
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Tessar-type
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gptkb:Newtonian_Telescope
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gptkb:Reflector
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gptkb:Steinheil_Orthostigmat_lens
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symmetrical
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gptkb:Celestron_25-inch_Newtonian_reflector
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Newtonian
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gptkb:Dobsonian_telescope
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gptkb:Newtonian_reflector
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