A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2016 Jan 27, 09:23 -0800
Fixed lens is the best. Zoom is big trouble. 35 mm lens using 10 mega pixel DSLR will give 1' precision. Lunars requires 0.1' precision so a 200mm lens is needed. The calibration of the 35 mm lens can be done working backwards from a known position using a natural or artificial horizon. The artificial horizon will save some time since the Sun is moving through the central field of view at twice the rate. The 200mm lens can be calibrated with a single image of the Sun using the known solar diameter as the yard stick.
P.S. Lots in the archives on this subject.
From: Bill Lionheart
Date: 2016 Jan 27, 03:54 -0800