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| Ring nebula is magnitude 9, and 0° 2'30" in aspect. Just to give you a frame of reference for size, the Andromeda galaxy is 2° 58'0" in aspect, eighty-nine times larger than the Ring nebula. And as for magnitude nine, what that means is that the brightness of the object is about two hundred fifty times dimmer than Andromeda, which is about magnitude 3.5. Canon EOS 50D, hooded Canon EF 200mm ƒ/2.8L USM II prime @ ƒ/2.8, ISO 12800, 2 sec. per exposure, fixed (non-tracking) tripod, 2 sec. holdoff time. Left half of the image is a single frame out of the 36 I shot; the right half is the stacked and processed result of 36 frames, including the one on the left. The noise of a single frame at ISO 12800 is so high and the FOV of the 200mm so narrow, I couldn't find the nebula (or even get oriented) two times; had to come home, look at the results on the big monitor, compare in my planetarium software (Stellarium) and go back out twice for a total of three trips. My shooting spot is 5.5 miles out, so this shot actually cost me 33 miles of driving.
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