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2. Amateur astronomy - Wikipedia

   en.wikipedia.org/wiki/Amateur_astronomy

   Amateur astronomers watch the night sky during the Perseid meteor shower.. Amateur astronomy is a hobby where participants enjoy observing or imaging celestial objects in the sky using the unaided eye, binoculars, or telescopes.

3. Thermal weapon sight - Wikipedia

   en.wikipedia.org/wiki/Thermal_weapon_sight

   A thermographic weapon sight, thermal imagery scope or thermal weapon sight is a sighting device combining a compact thermographic camera and an aiming reticle. [1] They can be mounted on a variety of small arms as well as some heavier weapons. [2] As with regular ultraviolet sensors, thermal weapon sights can operate in total darkness.

4. Night-vision device - Wikipedia

   en.wikipedia.org/wiki/Night-vision_device

   The device enhances ambient visible light and converts near-infrared light into visible light which can then be seen by humans; this is known as I 2 (image intensification). By comparison, viewing of infrared thermal radiation is referred to as thermal imaging and operates in a different section of the infrared spectrum.

5. AN/PSQ-20 - Wikipedia

   en.wikipedia.org/wiki/AN/PSQ-20

   The AN/PSQ-20 Enhanced Night Vision Goggle (ENVG) is a third-generation passive monocular night vision device developed for the United States Armed Forces by ITT Exelis.It fuses image-intensifying and thermal-imaging technologies, enabling vision in conditions with very little light.

6. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

7. Large Binocular Telescope - Wikipedia

   en.wikipedia.org/wiki/Large_Binocular_Telescope

   LUCI (originally LUCIFER: Large Binocular Telescope Near-infrared Spectroscopic Utility with Camera and Integral Field Unit for Extragalactic Research) is the near-infrared instrument for the LBT. [20] [21] [22] The name of the instrument was changed to LUCI in 2012. LUCI operates in the 0.9–2.5 μm spectral range using a 2048 x 2048 element ...