I thought this came out pretty well for a phone camera. From an iPhone 5S manually pointed through the eyepiece of my 6" dobsonian telescope. Spot metered with my finger. A little tricky, but I have the technique down now. I think they tiny lens of the iPhone camera is actually well suited to the purpose, and no expensive gear is needed (as I assume would be the case with an SLR). Taken from 6,300' in the sierra nevada, CA, at dusk (sun still setting actually, thus the bright spot).