WebThe telescope is fairly compact and lightweight. The ZWO FF80 is a hair under 18" long and weighs in at 10.3 pounds with rings and dovetail. The 80mm aperture scope uses a dual ED quadruplet optical system to help achieve its flat field. It has an f/7.5 native f ratio, but can be made faster with optional .76x Reducer further reducing the speed ... Web31 dec. 2013 · Orion Telescopes has recently begun offering Ritchey-Chrétien scopes in 3 sizes: 6″ RC , 8″ RC, and 10″ RC. These appear to be identical to those offered by Astro …

North Optics - North Optics

WebThe iOptron Photron Ritchey-Cretien design telescopes feature low thermal expansion quartz primary and secondary mirrors with ninety-nine percent reflective dielectric … Web14 aug. 2014 · You could compare the specs (weight alone is probably enough) of the iOptrons against the specs of other inexpensive RCs. I'd cheerfully take an even money bet there's no significant difference. iOptrons 6RC costs $400, just as everybody else's does. Warning, I have $1200 in mine, and I'm not alone. Good optics, mediocre mechanicals. dwight d eisenhower cold war significance

GSO 14" f/8 Ritchey-Chretien Astrograph with Carbon

WebiOptron Photron™ 8" Ritchey-Chrétien Telescope The iOptron® Photron™ Ritchey-Cretien design telescopes, feature low thermal expansion quartz primary and secondary … WebThe GSO 14" f/8 Ritchey Chretien Astrograph is a dream telescope for astrophotography. The telescope is fitted with a stable Carbon Fiber Truss tube and a precise 3" dual … WebThe TS 12" f/8 Ritchey-Chrétien Astrograph is a dream telescope for astrophotography. ♦ Aperture 12" / 304 mm. ♦ Focal Length 2432 mm. ♦ Focal ratio f/8. ♦ Hyperbolic primary … dwight d eisenhower coin worth