Related by context. Frequent words. (Click for all words.) 61 telescope 58 eyepieces 56 eyepiece 54 photometer 54 collimator 54 telescopes 52 optical telescope 52 CCD camera 50 imager 50 panchromatic 49 interferometric 49 reflector 49 Palomar Observatory 49 #.#cm thick [002] 49 polarizing filter 49 colorimeter 49 infrared 49 confocal microscope 49 scanning electron microscope 49 #inches 48 aperture 48 coronagraph 48 Microscopes 48 Hubble telescope 48 spectrographs 48 inch 48 magnifying lens 48 widescreen LCD 48 LCD touchscreen 48 infrared telescope 48 3in 48 binocular 48 Steward Observatory 48 spectrometer 48 #inch 48 astronomical telescope 47 #.#cm [003] 47 telescopic 47 LCD Display 47 flatbed scanner 47 loupe 47 9cm 47 diametre 47 superconducting magnet 47 HiRISE camera 47 spectrometers 47 LCD screen 47 #in [001] 47 optical microscope 47 3mm thick 47 Subaru Telescope 46 4cm 46 telescopic camera 46 projector 46 spectrograph 46 diameter 46 9in 46 Telescope 46 #X zoom 46 8in 46 magnifier 46 backlit LED 46 4in 46 Fresnel lens 46 #.#cm [002] 46 Robotic Arm 45 spectral imaging 45 #/#-inch [004] 45 infrared thermometers 45 interferometers 45 #x# inch [002] 45 Spectrometers 45 Samsung NX# [001] 45 laparoscope 45 #mm x #mm [007] 45 panoramic camera 45 WFC3 45 Ultra Slim 45 NASA Cassini 45 transmission electron microscope 45 orbiting Hubble Space Telescope 45 refractometer 45 6mm 45 stereoscopic images 45 tripod mounted 45 ultrasonic sensors 45 radar altimeter 45 Eagle Nebula 45 VLBA 45 viewfinders 45 Infrared 45 pinhole camera 45 centimeter 45 #x#cm [002] 44 microlenses 44 HD# [005] 44 Hubble 44 optical microscopes 44 JWST 44 astrophotography 44 photometry