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gptkb:0.61_m_Cassegrain_Telescope
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gptkb:Cassegrain_reflector
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gptkb:Celestron_25-inch_Newtonian_reflector
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Newtonian
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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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refractor (some models)
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gptkb:Celestron_CPC_Deluxe
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catadioptric
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gptkb:Cooke_refractor
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achromatic doublet
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gptkb:Klevtsov–Cassegrain_telescope
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Cassegrain configuration
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gptkb:50-cm_Zeiss_Cassegrain
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gptkb:Cassegrain
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gptkb:Distagon_lens
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retrofocus
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gptkb:Maksutov_camera
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meniscus corrector lens
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gptkb:Fujinon_XF_lenses
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aspherical elements (select models)
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gptkb:Ritchey-Chrétien_telescope
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gptkb:Cassegrain_reflector
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gptkb:Schneider-Kreuznach_Variogon
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multi-element
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gptkb:Schmidt_telescope
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catadioptric
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gptkb:Nikon_Monarch_binoculars
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gptkb:Roof_prism
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gptkb:Classic_Heliar
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gptkb:Heliar
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gptkb:Zeiss_refractor
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apochromatic
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gptkb:Steinheil_Cassar_lens
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3 elements in 3 groups
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gptkb:Maksutov_camera
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spherical mirror
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gptkb:Componon-S_lens
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6 elements in 4 groups
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