“Dodging and burning are steps to take care of mistakes God made in establishing tonal relationships.”
– Ansel Adams
The newer cameras on the market have a much better dynamic range than they did in the past. In low light conditions, the dynamic range (that is the difference between the darkest and the lightest part of the subject) is quite small. As a result with the newer digital SLRs, we are able to shoot in the most challenging low light situations. We are able to produce images which can be adjusted in Lightroom and Photoshop and bring out the beauty of the night sky.
Even with a camera with high dynamic range, it can be a challenge to deal with the noise and color of the sky when post processing.
Keep in mind when you are shooting in dark conditions, the image and the exposure may look great. Once you are out of the dark conditions, you will see that what looked like the perfect exposure , now appears to be extremely dark. The lesson here is to watch the exposure on the back of your camera and make sure that it looks brighter than expected. That way it should look good once you bring it in to Lightroom.