An in-depth look at low-level-lighting and Nightscaping by Royce Bair
This concise eBook is one of the few that explains a few of the issues around photographing the night sky in the southern hemisphere. More than that it is a brilliant insight into the technique of Low Level Lighting to bring nighttime landscapes to life.
It's a quick read and a fantastic reference to have on hand on your smartphone when you are out taking pictures under the stars!
The Vixen Polarie is an inexpensive and simple Star Tracking device. Tracking is really useful because it allows you to create longer exposures, capturing more light with less image noise.
The Polarie is a wonderfully simple little machine that is suitable for full frame DSLRs and allows a photographer to track the night sky.
Additionally, it can also be used horizontally for 360 degree timelapse movies. Compact, comprehensive and really good value - many astro togs aspire to owning one of these machines. They can save you a fortune in glass by doing something a lens will never achieve. Giving you more time for your exposure!
Star Stacking and Alignment to Control Noise
A nicely explained intro to star-stacking by Ian Norman