Whirlpool Galaxy M51 with ASIAir - 60sec x 144 = 2.4 hour integration time

First fairly successful attempt using ASIAir WiFi controller. Equipment: Celestron C8 SC with 0.63x reducer, ZWO ASI174MM camera guided with Orion ST80 and ZWO ASI290MC. Stacked and processed in ImagesPlus.

Done