WILLIAM OPTICS GUIDESTAR 61 F/5.9 APO Color:Gold 5 arc seconds

5 arc seconds

450mm diameter Cassegrains and so on

The ZWO ASI2600MM PRO P25 uses the back-illuminated 16-bit Sony ExMor IMX571 APS-C sensor

The bag fits the original packaging foam of your iOptron CEM40 mount

WILLIAM OPTICS GUIDESTAR 61 F/5.9 APO Color:Gold 5 arc secondsThe 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