The Radian 61 is an apochromatic refractor with an aperture of 61mm. With a focal ratio of f/4.5, the focal length of the telescope is 275mm.
With a weight of only 4 pounds, the Radian 61 is a wonderful telescope for portable set-ups.
Shown here with a Starlight Xpress Trius 694 CCD camera and an Orion 50mm guidescope outfitted with a Starlight Xpress Lodestar 2 guide camera, the Radian 61 yields highly detailed crisp images of deep sky objects.