Posted with permission of Jim Misti:
Again available at
http://www.mistisoftware.com/astronomy/index_fits.htm are many calibrated and integrated R,G,B,Ha file sets for many popular astronomical objects. They are ideal for use in improving processing skills. Jim says, "Should you decide to publish any resulting processed image (on a web site or in print), the only thing I ask is that the credit line include the phrase "Image Acquisition by Jim Misti". "
Dave