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There is a Yahoo group dedicated to the pursuit of the imaging of deep sky astronomical objects with specialized "narrowband" filters: astro_narrowband.

http://tech.groups.yahoo.com/group/astro_narrowband/

The group was started by Neil Fleming who has proven that achieving great images even under the light-polluted skies of Boston. From the group’s home page:

You’ve seen it! The sun in Hydrogen-Alpha or Calcium K light. Now, you want to share your excitement with everyone by photographing what you saw. Choosing a camera to do this can be a real adventure as there are many unique aspects of solar imaging that will need careful consideration.

Q: I just picked up a Canon Rebel XT and I've been impressed with its daytime capabilities, now its time to take it out at night. I'm curious about the ISO setting, there are notes throughout the manual that higher settings will cause a grainy image. As I understand it, the setting varies the

From discovering a new comet or supernovae to detailed observations on variable stars or binary stars systems, amateur astronomers have the relatively unique opportunity to make significant contributions to fundamental science through their individual efforts; and, with digital cameras becoming increasingly more sensitive, amateur astronomers increasingly are able to extend their reach to detect fainter objects with higher detail. At the heart of this improvement lies the image sensor, a critical component