M45 California 2x2 mosaic (Samyang 135mm f2, Nikon D7000a)
The data was collected almost a year ago at Maydanak observatory.
After that I've been struggling with processing due to strong background gradients.
This version is far from been perfect, but I'm happy with it and now know where to go next with processing. May be, additional 1 year of tries will be enough... :)