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Old 02-10-2016, 08:47 AM
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Merlin66 (Ken)
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Removal of Newton Rings in Solar imaging

Anyone using narrowband Ha solar scopes has probably come across the annoying Newton Ring interference pattern in their images.
On the solar chat site we've found a couple of solutions
- tilt the camera relative to the optical axis
- add a 2-4 degree wedge prism immediately before the sensor
Both these solutions slightly change the angle of the monochromatic light to the interference layers and suppresses the NR.
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Old 02-10-2016, 09:44 AM
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Maurice
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Hi Ken

I'm sure you can get these tilting arrangements from many sources, but here's just one that ZWO sells which seems quite affordable:

https://astronomy-imaging-camera.com...ies/t2-tilter/

I don't have any personal experience using it, so I can't offer an opinion either way about how well it works, but I think it was designed for this very purpose..

Cheers
Maurice
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Old 02-10-2016, 09:48 AM
SteveInNZ
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I don't see them with a 0.5x focal reducer with a QHY5ii and a Quark. They were quite pronounced without the reducer.

Steve.
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