WILLIAM OPTICS GUIDESTAR 61 F/5.9 APO Color:Gold 450mm diameter Cassegrains and so

450mm diameter Cassegrains and so on

With this configuration it could be necessary to perform the telescope inversion at the meridian passage in the case of the telescope striking the tripod

when combined with the included quadruplet reducer

keeping all eyepieces used with the 3x Barlow in like-new condition

WILLIAM OPTICS GUIDESTAR 61 F/5.9 APO Color:Gold 450mm diameter Cassegrains and soThe William Optics GuideStar 61 is an apochromatic guide scope with a focal ratio of f 5. 9 and a focal length of 360mm. Utilizing FPL 53 synthetic fluorite glass, the GuideStar 61 provides excellent aberration correction. The GuideStar 61 is compatible with QHY, Touptek ZWO and many other guide cameras (Note: some guide cameras may require an extra 2" extension tube to reach focus). The locking dew shield focuser allows you to easily reach the