M13

The equipment used was a William Optics Zenithstar 81 ED APO doublet refractor, f/5.5 with 0.88 APO flattener-reducer, a ZWO AEF, An Altair magnetic filter holder with an LPRO-MAX filter was mounted on an AVX mount. The mount was placed on permanent marks on the concrete base. An SVBONY SV165 guide-scope fitted with a QHY-5II-M guide camera was mounted on the handle dovetail of the imaging scope. An Altair Hypercam 533C Cooled OSC CMOS camera was mounted at the focus and AstroDMx Capture for Windows was used to capture data and control the Mount and the AEF via an INDI server running on a Linux computer. Autoguiding was by PHD2 running on a separate Linux computer.

One hour's worth of 5 minute RAW fits exposures of M13 were captured along with calibration data.

The data were debayered, calibrated, stacked and partly processed in PixInsight and post processed in Siril, GraXpert and Gimp 2.10 with Starnet++.

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M13

Steve Wainwright and Nicola Mackin