Sometimes I get these eyeshadows on the stars (blue color spots). Can someone help me ? 24 x 180s with ZWO585MC Pro, APO125 with Korrektor 0,8 = 780mm Stacked with siril Denoised with GraXpert Tuned with Gimp Thanks ! Reiner  |
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It's chromatic aberration. Put simply, your telescope is focusing the different wavelengths of light at different points. Very common with camera lenses and cheaper telescopes.
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Ths is an excerpt from a singleshot fits-file only RGB-converted and background extracted. You can see the "eyeshadow" . I used a 2"CLS_Filter from sybony. Is it caused by light-pollution ?  |
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Your image seems slightly out of focus. Try tighting up the focus and see whether the blue disappers.
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As others have mentioned it's looks like chromatic aberration from your optics. You can also get a color dispersion like this from shooting to low to the horizon. At anything much under 40 to 50 degrees elevation the atmosphere can ack like a prism separating the colors slightly vertically.
If you take a test shot near the zenith you can separate out the effects. If it's the optics then a "fringe killer" filter will help to minimize it.
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Thank you very much for the answers and the advises.The telescop-seller guessed, that the telescope was not good in focus.
I will test the different suggestions and tell you the results and successes !
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andrea tasselli:
Your image seems slightly out of focus. Try tighting up the focus and see whether the blue disappers. I just read this answer ! i think I will pay attention to control the focs more often ! Thanks !
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