California nebula under London Sky.

Conditions weren't exactly ideal: light pollution, obviously, then clouds rolled in just when I was ready to start my sequence, shortening capture time by a couple of hours.

Also, the nearly full moon was very close to the target, causing some nasty reflections on the (now cropped out) border of the image.

Overall I'm quite satisfied by the result though, the Optolong L-Enhance filter seems to be doing a really great job.