Related by context. Frequent words. (Click for all words.) 62 viewfinder 61 magnification 60 binocular 59 lens 59 aperture 58 lenses 58 camera lens 55 electronic viewfinder 53 CCD camera 53 infrared 53 polarized glasses 53 periscope 53 focal length 53 optical microscope 52 binoculars 52 telescope 52 endoscope 52 magnifier 51 imager 51 zoom lens 51 active shutter glasses 51 f#.# 50 colonoscope 50 Lenses 50 scanning electron microscope 50 optical viewfinder 50 parallax 50 #mm lens [002] 50 optics 50 microdisplays 50 LCD screen 49 adaptive optics 49 infra red 49 peripheral vision 49 focal lengths 49 EVF 49 apertures 49 microdisplay 49 pinhole 48 projector 48 interferometer 48 unaided eye 48 prisms 48 optic 48 telescopes 48 camera 48 3x optical zoom lens 47 tripod 47 Binoculars 47 magnifying glass 47 infrared laser 47 wavefront 47 infrared camera 47 reticle 47 polarized sunglasses 47 infrared sensor 47 photodiodes 47 viewing angle 47 #x zoom [001] 46 scopes 46 microscopes 46 #mm lens [001] 46 headlamp 46 telescopic 46 illuminator 46 optically 46 JWST 46 convex 46 polarized lenses 46 angle lens 46 diffraction 46 magnifiers 46 infrared IR 46 magnifying glasses 45 F#.# [001] 45 hemispherical 45 rangefinder 45 zoom 45 maximum aperture 45 infrared wavelengths 45 sensor 45 electron microscope 45 confocal 45 chromatic aberration 45 telephoto lens 45 SLR camera 45 lense 45 #x optical zoom lens 45 zoom lenses 45 helmet cam 44 pinhole camera 44 reflector 44 optical telescope 44 fluoroscopy 44 #.#x optical zoom [001] 44 imagers 44 f/#.# 44 spectrometers 44 photodiode 44 squinting 44 Hubble telescope