JockinIreland, David has submitted his capture of M31 the Andromeda Galaxy
The Andromeda Galaxy, also known as
Just click the link below to download and process David's image using your preferred software and methods.
https://drive.google.com/drive/folders/ ... sp=sharing
Data was captured at 2 different exposures to try to get core and outer details so about 3 hours each of 120s and 240s both at ISO800. Capture details, Skywatcher Evostar 80ED with 0,85 reducer (FL 510mm) EOS700D (pixel size 4.2 µm), dithered every frame 10 pixels max. Stacked in APP with full set of calibration frames. Available as 32bit Fits and 16bit tiff. The 2 stacks have not been registered to each other and since they were done largely either side of the meridian flip I think you’ll need to do that.
Known issues with the data; Large dark dust mote in bottom right landed between lights and flats!!
Stars in the very corners are very slightly elliptical – I had placed a 1mm spacer to increase the back focus spacing and it was just too much (Sorry – but its not that bad and can be cropped without much loss I think.
This is David's original posting: viewtopic.php?f=66&t=14122
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