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HI here are my first masters of HA , SII and OIII with my new setup (Takahashi FSQ-85EDX- 1.0X Flattener and Chroma 3nm SHO Filter) for my surprise in the SII master there are two stars with HALOS ( Tejat and Propus ) any ideas i would appreciate any suggestions just stretched, not DBE or anything else thank you    |
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As I stated in the other post about the FSQ-85EDX, mine was an earlier version, just the FSQ-85ED, and I never had any issues with halos or the hourglass effect on any stars. I also use Chroma 3nm SHO filters as well with no halos, so it must be in the design of the EDX, and or the flatteners or reducers as I can also see the hourglass effect on the two bright stars in your image as well. I don't think the halos are filter related. Just a thought. |
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| thank you for you help |
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| I have the same setup with FSQ-85 ED, 1.01 reducer and Chroma 3nm SHO filters, and get the same “inverse lighthouse“ effect. I contacted Takahashi America in Houston, spoke with a gentleman who owns two FSQ-85s and was told that pattern is due to diffraction and is intrinsic to the Petzval design. |
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| I also have a Takahashi 85 ED FSQ. The hourglass appearance on very bright stars is present on all my images using Astrodon LFGB filters. |
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yes the light house on very bright stars is a takahashi signature or pattern the problem is with the halos around the bright stars only SII |
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| How to fix the lighthouse effect: https://www.astrobin.com/forum/c/astrophotography/deep-sky-processing-techniques/a-way-to-fix-the-so-called-inverted-lighthouse-or-hourglass-effect-caused-by-the-tak-fsq-85-edx-on-some-bright-stars/ |
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| thank you dunk |
