A Spectrograph is an instrument that separates light into a frequency spectrum and records the signal using a camera. Spectrographs are used to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, relative motion, etc.
William Optics EyepiecesVixen Eyepieces and Barlow LensesCelestron Eyepieces & Barlow LensesBaader Eyepieces & Barlow LensesSky-Watcher and OVL Eyepieces and Barlow LensesExplore Scientific EyepiecesMeade Eyepieces and BarlowsOrion USA Eyepieces & Barlow LensesPentax Super-Wide Angle EyepiecesAPM Eyepieces and BarlowsVernonscope Eyepieces and Barlows
Altair Astro Eyepieces and BarlowsLunt and Coronado Solar EyepiecesZoom EyepiecesSpecialist EyepiecesReticle EyepiecesRonchi Eyepieces
BinoviewersEyepiece and Accessory SetsEyepiece Bags and Cases2-1¼ AdaptersEyepiece ClampsRings and ExtendersEyepiece Accessories