Filed under: Digital CamerasStellar photography seems like a wonderous thing: you and a loved one on a starry night taking beautiful images of the heavens -- before making out. Unfortunately, anyone who has tried it knows it's more often a frustrating exercise of fiddling with exposure and aperture settings on your SLR while it hangs precariously off the side of your telescope, held in place only by a flimsy adapter ring. The Imaging Source has a simpler option, a series of digital cameras designed for slotting into your scope like an eye piece, capturing the night sky at up to 60-minute exposures over USB or FireWire. The range starts at $390 for a monochroma