WExoLife Finder
WTelescope
W400 Years of the Telescope
WActive optics
WAdaptive optics
WAltazimuth mount
WAstrograph
WAstroscan
WAutomated Planet Finder
WBahtinov mask
WBirmingham Solar Oscillations Network
WCanopus Hill Observatory
WCarey mask
WChabot Space and Science Center
WComet seeker
WCraig telescope
WDark Energy Spectroscopic Instrument
WDiffraction-limited system
WGreat refractor
WEquatorial mount
WEquatorial platform
WEquatorial room
WEyepiece
WFirst light (astronomy)
WFoucault knife-edge test
WGalaxy H-Alpha Fabry-Perot System
WGoTo (telescopes)
WGreenland Telescope
WHale Telescope
WHartmann mask
WHexapod-Telescope
WHistory of the telescope
WInfinite-axis telescope
WLas Cumbres Observatory
WLiquid-mirror telescope
WMaunakea Spectroscopic Explorer
WMeridian circle
WNarrabri Stellar Intensity Interferometer
WNext-Generation Transit Survey
WOptical Gravitational Lensing Experiment
WOptical telescope
WOtto Struve Telescope
WPalomar Testbed Interferometer
WRefracting telescope
WRotating furnace
WRTT-150
WSchiefspiegler
WSchmidt corrector plate
WSchmidt camera
WSetting circles
WSkyMapper
WSubaru Telescope
WTelescope mount
WThirty Meter Telescope
WVacuum Tower Telescope
WVíctor M. Blanco Telescope
WZoom lens