For years, GSO has made dobsonian telescopes sold under various labels. Users of these scopes know the excellent quality of the optics included, and they have a well-deserved reputation for being the finest mirrors in their price range. We are now pleased to offer virtually the entire line of GSO's Newtonian optics in the US market.
GSO's elliptical flat mirrors have the same high quality as their parabolic primary mirrors. Made from optical grade BK-7 glass, all mirrors have a reflective aluminum coating with a reflectivity of approximately 92-93%. The aluminum coating is protected by a silicon oxide (SiO2) over-coating.
GSO uses high-volume, state-of-the-art, high quality manufacturing and test lines. GSO guarantees diffraction limited performance, but their secondary mirrors typically have a mirror surface quality of 1/12 wave RMS at least, and often better. This very smooth mirror surface results in excellent optical performance with practically no light scatter.
Besides elliptical secondary flats, we also offer matching GSO parabolic primary mirrors, mirror cells, and spiders (all sold separately).
Sep 7, 2018
80mm secondary mirrorPros: Cons: Comments:
This mirror came well packaged and arrived quickly. The only problem I have is as I was collimating my scope my holder came off and the mirror fell face down on my concrete driveway. I didn’t even get a chance to use it, now it has scratches all over the coating and a nice big chip on one side. But even with all these scratches and chips the mirror still produces amazing views. The next problem I have is I need a new mirror and unfortunately Agena is out of stock. I have a star party in 4 weeks and I hope Agena will be able to stock this size at least 3 weeks before the star party so I can get it in time. Agena please contact me if you have any 80mm secondary mirrors in stock somewhere as I really need one urgently. Otherwise I am extremely happy with their product and service. 5 stars from me
This review was provided courtesy of AgenaAstro.comSort by