I've always photographed the night's sky, especially when away from a city's lights. Usually with a wide angle, and sometimes with star trails. Only recently have I started focusing in on objects in the deep sky.
I'm still learning the best way to counter the Earth's rotation.
Orion Nebula (2000mm telescope and shakey t-mount)
http://3rik.me/cache/natures-company/star-struck/orion_nebula_1800_www.3rik.me_.jpg
And Andromeda Galaxy using a 35-200mm manual focus Rokinon lens- which made it easy to find objects at 35mm- and then zooming to 200mm to get a closer look. Sometimes, the lens would zoom on it's own (only once did it do that)
http://3rik.me/cache/natures-company/star-struck/andromeda_30mm_1800_www.3rik.me_.jpg
Andromeda at 30mm and f/1.4
http://3rik.me/cache/natures-company/star-struck/andromeda_200mm_1800_www.3rik.me_.jpg
Andromeda at 200mm using a clock drive aligned to the north star.
http://3rik.me/cache/natures-company/star-struck/warp-speed-delight_1800_www.3rik.me_.jpg
I've heard this referred to as 'zoom creep' or 'lens creep'... no creeping here, this is warp speed :D
More astrophotography here: #starstruck | Nature's Company | 3rik.me | Digital Showcase