Sun
Taken by Bill Hrudey on November 16, 2014 @ Cayman Islands
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Details:
AR2209, formerly AR2192, plus interesting prominences. Both offer an opportunity to sharpen imaging skills. Lunt60 DSPT; ASI120MM with and without 2.5 Barlow; FireCapture 2.3; Registax 6; PSP7. East/West reversed. Apologies for Newton's rings w/ Barlow.
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Bill

Are the Newton Rings a diffraction issue? Looks like that may be at play.

Franklin
Posted by Loehde1 2014-11-16 12:10:45
Hi Franklin;

My understanding is that this is common with CMOS (ASI120MM) sensors particularly when a Barlow lens is used and, is a diffraction issue when using narrow bandwidths eg H1a. Devices, both commercial and DIY can be placed in front of the camera to tilt it off-axis a bit. Some work and others have little or no effect. With the DMK41 (a CCD sensor) the problem is less noticable. I machined a tilt adapter but it made little difference. Some folks attribute the phenomenon to the sensor protective glass. So far, Ive just learned to live with it.

Bill
Posted by whrudey 2014-11-16 12:40:34
Hi Bill. I would like to invite you to our Facebook page Solar Activity. Please feel free to post your solar images. Thanks. Randy Shivak https://www.facebook.com/groups/solaractivity/
Posted by mr40mm 2014-12-09 11:41:10
 
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