ATT Volume 15 Issue 4

In this issue Rafael Fiol designs and 3d-prints a Newtonian reflector telescope; Keith Venables finishes his project of creating an electronic finder for a Dobsonian telescope; In his article “Radian Triad & Triad Ultra Performance vs. F-ratio” Jim Thompson offers a test report measuring how f-ratio affects the performance of multi narrowband filters; Mark Zaslove reviews the outstanding APM 152mm F/7.9 ED-APO;  Paul Temple shows how the Explore Scientific AR 102 offers great optics, the fit and finish is outstanding, is very portable all in an attractive price; plus industry news, new products and more!