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

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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

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Опубликовано:

28 июл 2024

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Комментарии : 12

@claudiotenreiro3111 7 дней назад

Thanks a lot, you nailed down, I have just tested it and works very well indeed !, I was a bit unconfortable with the use of the tilter, so thanks again for your nice solution. Best regards and CS!

@jeffrh 7 дней назад

Glad it helped... With my Quark and an UV/IR Cut in front of it. There us no solar heating to the prisms and if any it is from the fact that the sun is hitting the outside of the unit. Hasn't been a problem for me and I'm in the process of making a blocker so all the gear is in shade. Clear Skies...

@mauriziorvt Месяц назад

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 Месяц назад

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 28 дней назад

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 28 дней назад

@@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... ;-)

@whatmattersmost6725 21 день назад

WOW, GREAT!! I would not thought of doing this! I do have the ZWO ADC ( I would think any ADC will work) and will try it as I also have the Chromo Quark. I agree I was not a fan of tilting the camera to fix this.. Thank you!! Also Daystar sells a special clear film that scatters the light for better flats, and now with the ADC I may not need to use that?

@jeffrh 21 день назад

Funny what you think of when your in a bind... A Dispersion Corrector wasn't even on the radar until I happened to see it sitting in the unused section of my Astro stuff... I'm very familar with that DayStar Film and know a few individuals that have tried to use it without much success. Not sure if it is them or the film? Not worth it for me as I can make flats by looking for a quite part of the sun and going way out of focus. Then use SharpCaps Capture Flats option and I have a Master Flat that works very well. The Quark isn't show a full disk with my rig so it is an easy fix...