eyepiece, ocular

flashlights, telescopes, eyepiece, telephoto lens, magnifying glass, periscope, sunglasses, tripod, microscopes, spyglass, infrared, magnifier, penlight, scopes, camera, tweezers, goggles, gunsight, lenses, rifles, viewfinder, camera lens, vantage point, sniper rifle, lawn chair, sextants, compasses, earplugs, theodolite, stargaze, searchlights, rangefinder, eyeglasses, loupe, snowshoes, spotter, telescopic sight, glasses, bifocals, belted kingfisher, kayaks, otoscope, zoom lens, headlights, magnification, decoys, northern harrier, fishing rod, squint, stud finder, headlamp, gaze, fanny pack, borescope, stargazers, birding, metal detector, eyehole, magnetometer, refracting telescope, floodlight, backpack, torches, spectacles, spotting, needlenose pliers, pruning shears, treeline, birdwatchers, electron microscope, protractor, nocks, downy woodpecker, reconnaissance, bird watcher, spectroscope, porthole, wagtail, watchtower, moonlight, waders, spectrometers, pinhole camera, moonlit, shotguns, gimbals, sonar, uzi, curlews, dusk, thermos, radios, lookouts, stopwatches, lasers, mistle thrush, detectors, global positioning system, nebulas, optics, peepers, retroreflector, flashlight, motorcycles, cameras, headphones, automobiles, handgun, sedans, tractors, typewriter, motorcycle, parachute, pianos, timepiece, aeroplanes, airplanes, automobile, browse, display, format, mark, add, bowels, click, commensurate, compose, copy, doorbell, earned, gonna, hands, inestimable, kidneys, list, map, monopoly, ok

follow, glass, scan

optical instrument

binocular, field glasses, opera glasses