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First trials were done this morning using a camera bris reflector lens attachment and an artificial horizon. A 36 degree fixed angle Bris reflection is added to the angle observed directly between the artificial horizon reflection and the bris reflection. The total is then divided by two to get Hs. See the attached cropped image which shows the bright artificial horizon image to the left and the dim Bris reflection to the right (total 43* 24.7'/2 = 21*42.3' Hs). This image produced an intercept of exactly 2' away from GPS.

Greg Rudzinski

Camera CN with Artificial Horizon
From: Greg Rudzinski
Date: 2013 Nov 14, 21:30 -0800
First trials were done this afternoon to explore camera CN with an artificial horizon. The first problem was the halving of an already limited field of view. This restricts observations to less than 12 degrees of altitude for the 50mm lens used. Wind was a bit of a problem. To get a sharp steady reflected image it was necessary to wait for a lull then snap the shot. Camera settings: f22, 1/4000sec., ISO 100, infinite focus, no filters. All results came in better than 2'. During early twilight Venus was captured with camera settings: f2, 1/80 sec., ISO 1600, infinite focus, no filters. Results came in better than 2' even though Venus showed as a fat 5' fuzzy blob.

Greg Rudzinski
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