Apparently you can just put your camera against the eyepiece of a telescope and take a picture. I took this with my Canon S400 in macro mode at about 2x zoom to remove the vignette. The nice thing about the S400 is that the lens isn't much bigger than the eyepiece so it fits quite well. Also, in macro mode it can focus quite close. I'm tempted to get a proper telescope eyepiece mount to get longer exposure pictures of planets and stars.