|
gptkb:Zeiss_refractor
|
achromatic
|
|
gptkb:Schneider-Kreuznach_Variogon
|
multi-element
|
|
gptkb:Duomar_Lens
|
twin lens
|
|
gptkb:Newtonian_reflector_telescope
|
open tube
|
|
gptkb:Schwarzschild_telescope
|
anastigmatic
|
|
gptkb:Cooke_refractor
|
achromatic doublet
|
|
gptkb:ETX_telescope_series
|
gptkb:Maksutov-Cassegrain
|
|
gptkb:Maksutov-Cassegrain_Telescope
|
spherical primary mirror
|
|
gptkb:Maksutov_camera
|
meniscus corrector lens
|
|
gptkb:Jupiter-8
|
Sonnar-type
|
|
gptkb:Meade_16-inch_LX200
|
catadioptric
|
|
gptkb:Classic_Heliar
|
gptkb:Heliar
|
|
gptkb:Loxia_50mm_f/2
|
Planar
|
|
gptkb:50-cm_Zeiss_Cassegrain
|
gptkb:Cassegrain
|
|
gptkb:Celestron_25-inch_Newtonian_reflector
|
Newtonian
|
|
gptkb:Zeiss_refractor
|
apochromatic
|
|
gptkb:Distagon_lens
|
retrofocus
|
|
gptkb:Nikon_Monarch_binoculars
|
gptkb:Roof_prism
|
|
gptkb:Componon-S_lens
|
6 elements in 4 groups
|
|
gptkb:Maksutov-Cassegrain_Telescope
|
meniscus corrector lens
|