Advertisers in This Issue Astronomy equipment manufacturers and dealers are a valuable resource for amateur and professional astronomers alike. Patronize our advertisers in this issue and enjoy all the benefits of their expertise. Product Locator Alluxa » page 5 filters alluxa.com Astro-Physics, Inc. » page 81 mounts / telescopes astro-physics.com Atik Cameras » page 1 cameras atik-cameras.com Celestron » page 3 accessories / binoculars / mounts / telescopes celestron.com iOptron » page 11 mounts / telescopes ioptron.com QHYCCD Light Speed Vision » page 11 cameras qhyccd.com Sky-Watcher » inside front cover + back cover binoculars / mounts / telescopes skywatcherusa.com Stellarvue » inside back cover eyepieces / telescopes stellarvue.com Ad Index AAVSO ..................................................... 81 Alluxa ........................................................ 5 American Astronomical Society ................ 73 Arizona Sky Village Portal ......................... 81 Astro-Physics, Inc. ................................... 81 Atik Cameras ............................................. 1 Bob's Knobs ............................................. 80 Casitas de Gila Guesthouses .................... 81 Celestron ................................................... 3 iOptron .................................................... 11 Knightware .............................................. 80 Lunatico Astronomia ................................ 80 NexDome ................................................. 81 Nine Planets Ring .................................... 81 Northeast Astronomy Forum ..................... 13 Precise Parts ........................................... 80 QHYCCD Light Speed Vision ..................... 11 Revolution Imager .................................... 81 Sky & Telescope .....................13, 71, 73, 83 Sky-Watcher ...................................... C2, C4 Star-Hop Maker ....................................... 80 Stellarvue ................................................ C3 Technical Innovations ......................... 80, 81 Willmann-Bell .......................................... 80 To advertise in our Product Locator, please contact Tim Allen at 773-551-0397, or email him at Ads@skyandtelescope.org 82 APRIL 2022 * SKY & TELESCOPEhttp://www.alluxa.com http://www.ioptron.com http://www.astro-physics.com http://www.qhyccd.com http://www.atik-cameras.com http://www.skywatcherusa.com http://www.celestron.com http://www.stellarvue.com