Originally posted by valy Saturn is a difficult task, you can take several shots and crop&stack them, but it is a waste of time, usually you need a lot of frames to get better results, filming is not good unless Pentax provide 100% crop movie, still pictures consume the shutter. Anyway it is nice to see the Saturn
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Mee too. I think I made some mistakes, but don't know where, after several shoots I get various results, none being close to a normal EQ mount tracking platform.
After about a year of ownership and very frequent use of the O-GPS1 (as frequent as the lousy Danish weather permits), I should say that I get fairly consistent results. So, my experience is that as long as you have the most recent firmware update and get confirmation on 'Precise Calibaration OK' there is little more you can actually do and to my experiences there are only the following three issues to observe:
1. The magnetic sensor seems to be by far the largest source of inaccuarcy. By all means do the Precice Calibration and use the astrotracer safely away from very localized magnetic disturbances, be they man-made or geological.
2. As GPS satellites change their positions the quality and number of signals received may change. A short break followed by a renewed Precise Calibration may be required from time to time during a night's session.
3. There remains a certain element of "black magic" to the operation of the Astrotracer function. On any night do try to use it at different azimuth and altitudes. Chances are that on any night, some directions will work better for you than others. On those nights where everything seems to conspire against you, try using your widest lenses only.
If problems persit, I would suspect that errors would most likely, though not exclusively, be found in the camera body sensors and/or actuators. I know of no other way of checking that than trying out your O-GPS1 unit on another K-5 body.