Hello friends!
Last weekend I was doing some pictures and I've noticed an interesting effect (or issue). Using high gain appeared concentric rings (not newton rings I think) in center of picture...
Have you ever seen it before? What is that?
Equipment utilized:
Telescope: APM LZOS 152/1200 (triplet)
Solar Filter: SolarSPectrum 0,3A Research Grade
Telecentric Lens: Baader TZ3 and TZ4 (I´ve the same effect in both) and Baader 0,4x telecompressor.
Camera: Basler acA1920-155
BR
Ronnie
Help me to know what is that...
- Ronnie_Clayton
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Re: Help me to know what is that...
Those appear to be either Newton's rings or FP etalon interference fringes:
https://en.wikipedia.org/wiki/Newton%27s_rings
https://en.wikipedia.org/wiki/Fabry%E2% ... rferometer
They could be an internal reflection issue with your imaging system, or there might be something amiss with your filter system; perhaps a decontacted polarizer or other filter component. I would send this image to the vendor for evaluation and forwarding to Solar Spectrum for analysis.
https://en.wikipedia.org/wiki/Newton%27s_rings
https://en.wikipedia.org/wiki/Fabry%E2% ... rferometer
They could be an internal reflection issue with your imaging system, or there might be something amiss with your filter system; perhaps a decontacted polarizer or other filter component. I would send this image to the vendor for evaluation and forwarding to Solar Spectrum for analysis.
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Re: Help me to know what is that...
I think it's just an internal reflection... Try without the telecompressor and see if the effect is still there, process of elimination...
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
- Ronnie_Clayton
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Re: Help me to know what is that...
Thaks for your suppport Bob and Mark :-).
I´ve sent an e-mail directly to Mark from SolarSpectrum, he says me that he had never seen it before. Not Newton Rings like that, "looks like a topographical map". Mark asked me to try differents configs to try eliminate it like a Newton Rings (tilting the camera).
It is clouding this weekend here in Maringa, next weekend I will try other configs to verify it. But, it just appears in very high gain...
Ronnie
I´ve sent an e-mail directly to Mark from SolarSpectrum, he says me that he had never seen it before. Not Newton Rings like that, "looks like a topographical map". Mark asked me to try differents configs to try eliminate it like a Newton Rings (tilting the camera).
It is clouding this weekend here in Maringa, next weekend I will try other configs to verify it. But, it just appears in very high gain...
Ronnie