Whirlpool Galaxy (M51)
This image was captured on a night with superb transparency. Unfortunately, heat radiated away so rapidly after sunset (when temperature was about +8 C) that at 9 PM my equipment was hit by a hard frost. I battled condensation on my objectives for the rest of night, only managing to capture 6 more useful frames before midnight, when my batteries died from running a small hair dryer. Two more frames would have improved this image quite a bit.
This was acquired using the modified Canon 50D, so is red-enhanced. I'm working on acquiring more frames with both cameras to produce a combined image.