You probably want something like the Vixen Polarie for that.
On 12/1/2013 7:06 AM, Larry Colen wrote:
http://www.fluidr.com/photos/ellarsee/sets/72157638239972733/ Even with the astrotracer 30 seconds at 500mm is too long. Now, I need to find stacking software for my mac. These were photographed on Empire grade at the gate for Grey Whale ranch, with my Pentax K-5 II, using my O-GPS 1 in astrotracer mode. Some were shot with John Francis' 80-200/2.8 and some with my bigma. I learned that using a ballhead sucks for astrophotography. It is impossible to make fine adjustments in just one axis. Hell, it is impossible to make accurate fine adjustments period.
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