{"id":67,"date":"2012-09-27T14:55:40","date_gmt":"2012-09-27T14:55:40","guid":{"rendered":"http:\/\/starrydave.com\/?p=67"},"modified":"2013-05-12T12:59:16","modified_gmt":"2013-05-12T12:59:16","slug":"banish-newtons-rings","status":"publish","type":"post","link":"http:\/\/starrydave.com\/?p=67","title":{"rendered":"Banish Newton’s Rings"},"content":{"rendered":"

We had a good discussion on my old Yahoo user group about how to remove Netwon’s Rings from your h-alpha setups. I have condensed the results of our discussion here to help others with this problem.<\/p>\n

Newton’s\u00a0rings<\/a> are caused by interference arising from internal reflections in your imaging train and look like this.<\/p>\n

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Newton’s Rings<\/p><\/div>\n

User Robert suggested that the rings could be eliminated by slightly tilting the camera. I came up with a simple design sketch like so.<\/p>\n

Daves Tiltometer Mk II<\/a><\/p>\n

Users Robert, Mike and Jack then built test versions which seem to work very well. Jack’s version was used to re-image the above view to give this which is a dramatic improvement.<\/p>\n

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Newton’s Rings Eliminated by Dave’s Tiltometer<\/p><\/div>\n

Robert and Jack produced pdf info and foto sheets for their\u00a0tiltometers which are here.<\/p>\n

Robert<\/a><\/p>\n

Jack<\/a><\/p>\n

Mike uploaded a range of fotos of his version and results which are here.<\/p>\n\n\t\t