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Hi All. Need your help on my first try at M51. After stacking around 1 hour+ of 2 mins exposures this is what I got. I wasn't able to use darks and flats because I had a problem with the darks that I took during that night. I'm getting a slight red tone on the background when I enhance with levels and curves in Photoshop. I took the image in a fairly dark site but I used a UHC filter to see if it has any help on the image. My equipment is a Celestron C6N reflector, Nikon D90, and a Baader UHC filter.
2hrs with EOS650D at 18Mp shooting visual colour range (240s subs @ ISO800), 1.5hrs with EOS1000D Full-spectrum-modified (no narrowband filters) at 10Mp (120s subs @ ISO800 as core blows out VERY easily in full spectrum). 5x dark frames and 20x bias frames for the EOS1000D session. No flats.
Stacked in DSS 64bit with 2x drizzle, processed in Photoshop CC 2018 (very little needed doing to it to be honest, just pull the saturation up a bit to bring the colour out).
This is a heavy crop hence the apparent low resolution of the final image.
This was the last outing for the EOS650D before I killed it, hence no darks / bias applied to the subs from that camera - it died in process of taking it off mount to shoot darks etc whilst I packed everything else away.
M51 The Whirlpool Galaxy 21.04.18 My first proper attempt at RGB imaging with the monochrome CCD Imaged using William Optics FLT-110 and Atik 314L monochrome camera. 10 x 300 seconds R, 10 x 300 seconds G, 2 x 300 seconds B (as I had to delete the other 8 due to technical issues). 10 x 300 seconds Luminence. I will have another look at this data once I have done more reading up on combining my Luminence data with the RGB data as it was a case of having a play around this morning. However, I'm very happy with my result for now.
This is my first image with a Canon 500D, modified for astro. Seems to be a big improvement on my unmodded NikonD5300. I guess its not the best subject for increased sensitivity though. I think some of the tidal structures are showing?
And this shows what else is present....
This is the 2nd ever DSO I have captured (the first being Pleaides). I have very limited experience processing images after stacking. I have attached some of my efforts to draw detail out of M51.
There is only around 30mins of data in the TIF file (30x60sec @ ISO800, Skywatcher 200DPS), 10 darks and 10 bias. This is all I could capture before the clouds rolled in. I have tried following some youtube tutorials but am struggling to get rid of the grey-ish tinge to the image and reduce the noise. There also seems to be a dark horizontal band across the image which I think might be a stacking artifact ? I am using Photoshop and have mainly been adjusting levels and curves but not quite sure where to go next.
If anyone could give some advice on processing M51, what processing steps they normally take etc.....or even have a quick go at processing it that would be amazing.
Thanks in advance