WAMBER (Very Large Telescope)
WDynameter
WESPRESSO
WFibre multi-object spectrograph
WFine guidance sensor
WGemini Planet Imager
WHigh Accuracy Radial Velocity Planet Searcher
WK-band multi-object spectrograph
WKepler photometer
WMASCARA
WMulti-unit spectroscopic explorer
WPIONIER (VLTI)
WSpectro-Polarimetric High-Contrast Exoplanet Research
WSwiss 1.2-metre Leonhard Euler Telescope
WVisible Multi Object Spectrograph
WVortex coronagraph