AstroTrac (NEW) TT320X-AG Tracking Mount with Auto-Guiding port for Digial SLR Cameras includes Asto Trac Illuminated Polar Scope, 12 Volt Car Battery Adapter Now your camera can reveal the heavens in a way which isn't possible with the naked eye. During an exposure of several minutes, this movement will show up as star trails in photographs. The AstroTrac follows the movement of the sky with great accuracy eliminating star trails