End of February 2014 I already recorded M101 from Boeblingen near Stuttgart. The total exposure time was about 6 hours (!). This time I did a 2h40m exposure from Los Llanos de Aridane on La Plama with exactly the same equipment. This is the result. From my perspective the two pictures do not have a big difference despite the colour tone which of course depends on the post processing.

	Date	2017/03/31
	Location	La Palma / Spain
	Object	Pinwheel Galaxy M101
	Camera	Atik383L+
	Guiding	yes, QHY5-II Mono via OAG
	Telescope	8" GSO Newtonian
	Barlow lens	none
	Mount	EQ6Syntrek
	Cooling	-10°C
	Luminance	10x 600s, bin: 1x1
	Red	8x 150s, bin: 2x2
	Green	8x 150s, bin: 2x2
	Blue	8x 150s, bin: 2x2
	Dark	2x
	Flat	10x
	Total exposure	~2h40m

However, it’s interesting to compare the results with respect to their total exposure time: The image recorded from Boeblingen was exposed more than two times longer.

As a result of the long exposure time the stars are not as perfectly round as the ones with a shorter exposure time. Despite that I am happy to see what is still possible from a city like Boeblingen 🙂 Finally I combined both images to one final image by rotating one image until it matched exactly. Maybe I am wrong but I think in the end this combined image has a little more detail than each of the pictures alone. A full resolution image is available here.