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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Daytime Venus Rising Dip Short
From: Bill B
Date: 2012 May 09, 00:13 -0400
From: Bill B
Date: 2012 May 09, 00:13 -0400
On 5/3/2012 6:20 PM, Greg Rudzinski wrote: > I used an older 10 MP Canon Rebel with an adaptor to take a 1970's era > 200mm prime Pentax lens. The filter for the first photo had astronomy > mylar film over the lens (didn't work that good). The second image used > a pair of polarizers then the settings were at F22, ISO 100, and > 1/4000s. In iPhoto the image was cropped then adjusted for contrast, > exposure, etc. Were you using "old school" linear polarizing filters? (I am not clear if circular polarizing filters can be "crossed" to reduce light throughput.) There is a concern that linear filters can interfere with exposure and auto focus on digital cameras. Have you had experienced any exposure or focus problems? Bill B