March 16, 2018 - This was the first chance I’ve had to put...

March 16, 2018 - This was the first chance I’ve had to put the ZWO ASI071MC through some serious long exposure tests on four very different targets, the region around Alnitak in Orion, the Rosette Nebula, Markarian’s Chain, and M101 - Pinwheel Galaxy. I ran most of these frames with unity gain (90 Gain, 20 Offset), and I built up a nice library of dark calibration frames in the afternoon, for 600, 300, and 120 second exposure times. Here’s my setup for last night’s astro session, with the William Optics GT81 APO refractor, ZWO Astronomy Cameras ASI071MC-C, iOptron CEM25P EQ mount.