Originally posted by mikeSF were you able to calibrate using the manual lens? I cannot calibrate with any manual lenses mounted as the accellerometer ends calibration and dims the screen when the camera is tilted even a little. must have something to do with the contacts??
I just took delivery of my O-GPS1. The behaviour you describe sounds strange to me: I started out my astro tests with my fully manual smc Pentax-M 2.8 / 100mm and have had "text-book" behaviour as far as calibration and precise calibration are concerned.
So far, I have restricted myself to reasonably short exposure times (about 30 sec.) fairly high in the sky with this lens because I live in a severely light polluted area, but results with this lens have so far been encouraging.
Althoug the manual doesn't say, I am pretty certain that the higher the altitude in the sky, the more error will one have in the compass reading and thus in the tracking. However, Your account of the effects of firmware upgrade from 1.12 to 1.13 triggers me. I'd better do that tonight as well !!!