Related by context. Frequent words. (Click for all words.) 56 refractor 55 telescope 54 telescopes 54 spectrographs 54 coronagraph 53 Celestron 53 eyepieces 52 georeferenced 52 collimated 52 eyepiece 51 photometer 51 magnifications 51 infrared 51 unaided eye 51 astronomical telescope 51 astronomical objects 51 opto mechanical 51 fluorescence microscope 51 panchromatic 51 spaceborne 51 spectral imaging 51 binocular 50 imager 50 HiRISE camera 50 optics 50 interplanetary spacecraft 50 interferometric 50 infrared imagery 49 hyperspectral 49 altimeters 49 Paranal 49 photometry 49 multibeam 49 laser altimeter 48 Spectrometers 48 Telescopes 48 inclinometer 48 telescopic 48 borescope 48 optical telescope 48 CCD camera 48 XP# [004] 48 X ray telescopes 48 polarizing filter 48 CubeSat 48 lenses 48 infrared wavelength 47 optical microscope 47 fishfinder 47 interferometers 47 #X zoom 47 synthetic aperture radar 47 laser rangefinder 47 Spherical 47 radar altimeter 47 rangefinder 47 Slooh 47 WFPC2 47 HD# [005] 47 LINEAR 47 oblique angle 47 HRSC 47 millimeter wave radar 47 TerraSAR X 47 Near Infrared 46 photometric 46 Pan STARRS 46 optical wavelengths 46 #.#mm x #.#mm [001] 46 Magnetometer 46 adaptive optics 46 SIRTF 46 obscuration 46 extrasolar 46 ultraviolet wavelengths 46 FOV 46 5x optical zoom lens 46 Siding Spring 46 radiometer 46 Telescope 46 Infrared 46 Satellite Imagery 46 magnification 46 multispectral 46 colorimeter 46 geodesy 46 orbiting Hubble Space Telescope 46 VLBI 46 XMM 46 radomes 46 infrared detectors 46 Subaru Telescope 46 infrared telescope 46 zoom lenses 46 nebulas 45 frameless 45 LOFAR 45 ionospheric 45 optical microscopes 45 Microscopes 45 solar corona