M51 from a favorable location

There can be little doubt that taking astrophotos from a dark site high into the mountains is favorable to inner city with light pollution. But the difference is truly staggering. The following photo was taken with a remote telescope on Teide, Tenerife. The telescope is 20" f/6.8. And has a FLI ProLine FL09000 camera with LRGB filters. I ordered three images of the galaxy M51, and stacked them and combined them manually. The result is staggering, despite the short exposures. 6x50 sec Luminance and 3x40 sec each of R, G and B.