A few star trails pictures taken this evening.
First is a single long exposure. (Orion Constellation)
Camera: Canon EOS 50D w/EF 28-135mm lens @ 28mm f/6.3, ISO-100, 15.4 minutes.
Next two are multiple exposures, stacked and processed in Photoshop.
NorthWestern Sky: ISO-1600 30x30seconds
Southern Sky featuring the Orion Constellation, ISO-1600 55x20seconds.