Do You Have Newton Rings? Then Try This...

Hello everyone
It has been a minute since my last video and that is mainly because of my weather. Not much one can do about it other than move somewhere else which isn't going to happen... ;-)
Since getting into solar Astronomy. I have always had Newton Rings. Asking around and doing some research on them. The fix always seems to be to tilt the camera which is the exact opposite of what I was trained to do with any camera. I spent most of my time with cameras of any kind making sure the camera was straight to the optics.
A couple of months ago I started to think about a solution that wouldn't require me to tilt the camera and I went on a hunt through my unused Astro toys. There I found a ZWO Dispersion Corrector and the light went off. This adaptor uses prisms to bend the light path and if this worked like I hoped. I didn't need to tilt my camera.
This video will show you the problem I have and then I'll show you the gear and finally, I show how easy it is to remove those pesky Newton Rings forever from any solar rig. Thanks for your patience while I had to wait for the weather... Clear Skies

[@papabear8191]

Interesting tips !

[@jeffrh]

Hope they can help you also...

[@mauriziorvt]

I had the same idea a month ago and I verified that it works nicely in practice as well as in theory. Newton rings are formed because the optical path is very narrow, about f:25 or f:30 due to the 4.2x telecentric barlow in the Daystar Quark filter, and internal reflections tend to form interference patterns, especially in monochromatic light. By tilting the camera or interposing the ADC corrector the same result of disrupting the interference patterns is achieved. I think they are caused by the optical window of the camera, placed very close and parallel to the sensor, and the reflected light from the sensor itself.

[@jeffrh]

Thnaks for the info... Rock Mallin the maker of Mallincam cameras has a couple of SolarCams that he says fixed the Newton Rings issue and from those that have his cameras, seems they work very well. I didn't feel like spending the cash just for a Soalr Camera as I like the ones I have now and the Dispersion Corrector saved my bacon... ;-)

[@jmm3194]

I think the Newton rings are just caused by the Fabry-Perot etalon inside the Daystar Quark, and not by the window of the camera. Actually the rings are visible in cameras with and without window

[@jeffrh]

@@jmm3194 I know a few people that have purchased a SolarCam and they say the camera helped with their Newton Ring issue. They also have Quarks similar to my set up and Lunt Solar Scopes... I didn't feel like spending the cash for another camera when I'm very happy with what I already have. Not sure what this means as this is way above my paygrade... ;-)

[@charlesowillford2474]

I think you meant 90 deg rotation; if the video is showing it correctly?

[@jeffrh]

Looks like my dyslexia kicked in at the wrong time... Thanks for the heads up...