field glass Definition

glass, spyglass, binocle, polemoscope, optical instrument, lorgnon, binoculars, optical device, telestereoscope, perspicil, light microscope, telescope, eyepiece, monocular, compound microscope, maksutov telescope, dynameter, opsiometer, telespectroscope, catadioptrics, schmidt telescope, galilean telescope, coelostat, lorgnette, telepolariscope, stereomicroscope, microscopium, solar telescope, loupe, periscope, lense, nicol prism, telephoto lens, optometer, simple microscope, uniocular, phenakistoscope, microscope, magnifier, dioptrics, microspectroscope, pantascope, optigraph, optical telescope, reflex camera, astronomical telescope, box camera, catopter, pinhole camera, ophthalmometer, stereoscope, goggle, cover slip, biprism, viewfinder, catoptrics, louchettes, catadioptric, scioptics, phantascope, achromatic lens, stereomonoscope, optic, eyeglass, monocle, refractor, spectroscope, spyhole, anaclastics, phototheodolite, phakoscope, chromatoscope, sunglass, newtonian telescope, zograscope, pancratic, squint, gunsight, telescopy, orthoscope, epidiascope, perspicience, eyeglance, wire glass, horopter, prism, holophote, camera, terrestrial telescope, dipleidoscope, eyehole, spectacle, megalethoscope, fisheye lens, aclinic, vitrella, alethoscope, quadrantanopia, cheval glass, zoom lens,