12/12/17My EdgeHD optical tube assembly (OTA) has four small tapped holes along the front rim. What are they for?
10/28/09My refractor shows color fringes since it’s not an apochromatic design. Is there any filter or way to reduce these fringes?
10/20/09The AstroMaster 114 models have a 1000 mm focal length. Why are the tubes only 508 mm long? Is this a mistake?