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It seems that there are as many variations of this little object as there are astrophotographers tackling it. Had a discussion with Göran in his M76 thread about the colours of this nebula.
This is from Ha, R, V and B data from the Liverpool telescope. There is plenty of data, so I only selected one single image exposure time per channel (but approximately 30 - 40 subs per channel).
The object has a very bright core and very faint detail further away. HDRwavelet transform was used to tame the dynamic range.
In retrospect, I have overdone the deringing during deconvolution, and paid for that with rather soft stars.
(The link leads to an album with this image in various sizes)
On the 24th of January 2017, some user of the Liverpool Telescope decided to spend a few frames on Thor's Helmet. This is the only data on this object in the LT database and it consists of seven 120 s exposures, 3 with a Ha filter and two exposures of each of Bessell V (green) and Bessell B (blue). That is not much data but also not much work to stack, so I had a go at it. So this is a 14 min HaGB image. Thus, I put the Ha data in the red channel (since there were no red filter data), which probably explains the slightly unusual colours. All done in PS CS5.
This is of course a rather noisy image (pixel peepers should stay away) compared to the Little Dumbbell that I recently posted with 3.6 h of LT data. Still, I am slightly amazed what a big scope can collect in 14 minutes.
The scope is a 2 m RC f/10 (so 20 m focal length!) equipped with a 6 x 6 cm (15 µm pixels) 18 Mpix CCD camera (normally run at 2x2 bin) of the brand e2v, which I think is chilled to -100°C.