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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2016 Jul 24, 05:18 -0700
Hello Greg,
Fantastic Job ! Well done ! The Frog is impressed !
Kermit
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Re:
From: Greg Rudzinski
Date: 2016 Jul 19, 13:44 -0700
Attached is a graph for determine the minutes of arc per pixel for pixel counts from 700 to 3700 on the 28mm Pentax prime wide angle as used on a Canon Rebel 1.5 frame DSLR body. The 22 sextant horizontal angle images used to creat the graph took about 40 minutes to capture. Image processing and graph construction took about 1.5 hours. Checking for repeatability shows a spread between 0 and 3.5' toward so there is a toward error bias in the graph. The spread is about right for the expected +/- 1.4' precision of the 28mm wide angle. So far I'm satisfied with the results and the 41° field of view.
Greg Rudzinski
