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gptkb:Duomar_Lens
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twin lens
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gptkb:Maksutov-Cassegrain_Telescope
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secondary mirror (often aluminized spot on corrector)
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gptkb:Newtonian_Telescope
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gptkb:Reflector
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gptkb:Biogon_lens
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symmetrical
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gptkb:Maksutov_camera
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meniscus corrector lens
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gptkb:Celestron_25-inch_Newtonian_reflector
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Newtonian
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gptkb:ETX_telescope_series
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gptkb:Maksutov-Cassegrain
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gptkb:Schneider-Kreuznach_Variogon
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multi-element
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gptkb:Schneider-Kreuznach_Xenar_38mm_f/2.8
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Tessar-type
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gptkb:Maksutov-Cassegrain_Telescope
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spherical primary mirror
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gptkb:Distagon_lens
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retrofocus
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gptkb:Nikon_Monarch_binoculars
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gptkb:Roof_prism
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gptkb:Zeiss_refractor
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achromatic
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gptkb:Schmidt_telescope
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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:Meade_LX200_14-inch
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gptkb:Schmidt-Cassegrain
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gptkb:Jupiter-8
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Sonnar-type
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gptkb:Celestron_14"_SCT
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gptkb:Schmidt-Cassegrain
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gptkb:Jupiter-3
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Sonnar-type
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gptkb:ETX_telescope_series
|
refractor (some models)
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