A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Marcel Tschudin
Date: 2012 Sep 17, 11:45 +0300
I'm trying to keep to simple hand held methods. The best way would be a motorized tripod set to latitude that has the camera shutter held open. This would provide flexibility for ISO and f stop settings. No room or money for smart tripod gear though. I'm satisfied with the hand held lunar camera trial results so far and will be trying for a full lunar calibration series using the 50 mm lens.
It looks like the calibration with star distances might be better than you feared. To my understanding the refraction should be added to each of the stars separately before calculating the apparent distance, as indicated by Brad. I do not have the tools to calculate local star positions. If Brad's value is correct then your result from the photo with the blotches differs only by rounding errors, i.e. by less than 0.05 moa. I consider this a "lucky" value since your present calibration is not better than +/-0.5 moa.