Over the course of 5 nights the rather unremarkable and ordinary comet NEAT (after it's discovery through the Near Earth Asteroid Telescope) made it's way from a good distance from the sun that required ISO 400 for 15 seconds on the right to the one on the left that was taken a little while after sunset at ISO50 at 1/4 sec. Notice how the tail is starting to turn as it gets nearer to and starts turning around the sun. This was barely visible if at all by unaided eye, but visible with binoculars. There are a number of these that come in toward the sun every year, - but this was my 1^st one. Pretty NEAT eh ?

8" F10 Schmidt Cassegrain Telescope, 40mm eyepiece, Canon G2 at 1.8x
Right, F2.2, 15 sec, ISO 400
Center, F2.2, 10 sec, ISO 200
Left, F2.2, 1/4 sec, ISO 50
3 single photos, brightness and contrast enhanced, resized and cropped to show series.