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Come join the newest, most engaging and inclusive astronomy forum geared for beginners and advanced telescope users, astrophotography devotees, plus check out our "Astro" goods vendors.
That's very interesting. Watched a documentary on Hubble's history which dated back to 1990 last night, they had to install a corrective lens to balance the coma/distortions of the primary mirror, both STS missions.
-Michael Dobsonian: 10" Zhumell f/4.9 Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8, KOWA 90mm spotting scope Grab-n-go: AWB 5.1" Onesky Newtonian Binoculars: Oberwerk 25x100, Celestron SkyMaster 15x70, Bushnell 10x50 Eyepieces: Explore Scientific line, GSO Superview, 9mm Plossl, Edmund 28mm RKE, Celestron 25mm Plossl Camera: ZWO ASI 120 Naked Eye: Two Eyeballs Latitude: 48.7229° N