My best shot of M51 so far. In total I selected the best 200 frames out of 591 using my own experimental stacking program. The exposure time of each frames was 10 seconds.

The final stack was further processed in Photoshop CS4 and Iris.

equipment used
Meade Starfinder 10
Philips Vesta Pro 680k webcam - SC3 with b/w ICX424AL-E ccd