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Sun in H-alpha - Blurry areas [Solar System] Acquisition techniques · Jean-David Gadina · ... · 2 · 131 · 3

macmade 3.01
Jean-David Gadina
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I recently started imaging the Sun in H-alpha with a Lunt 60mm telescope (single stacked) and a ZWO AS1678MM.
I'm really happy with this setup, but I sometimes get blurry areas on the Sun.

It does not always happen, but when it does, I cannot find the correct settings to have a sharp capture.
Some areas are still blurry, no matter how I set the focus or the etalon.

Here's an example. The blurry area is at the top left.
Full resolutions are available here: https://www.astrobin.com/lg7xny/



The sky was clear on this day.
I took 1217 frames and stacked them, keeping the best 200.

Why does this happen, and can I do something to get better captures?
Is this due to some atmospheric conditions, a problem with my setup, or a problem with the person behind the telescope?

Thanks for any advice!
Clear skies!
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oecheverri 1.20
Oscar Echeverri
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Is your entire image train assembled with threaded connectors? Or are some elements using a pressure fitting / screw?
Any slop in your train will introduce tilt into your system relative to the optical axis of your telescope, and you'll end up with areas of your image that are out of focus
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macmade 3.01
Jean-David Gadina
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Oscar Echeverri:
Is your entire image train assembled with threaded connectors? Or are some elements using a pressure fitting / screw?
Any slop in your train will introduce tilt into your system relative to the optical axis of your telescope, and you'll end up with areas of your image that are out of focus

Thank you very much for your answer!
Now I think I finally understand the issue.

The camera is attached directly to the blocking filter with threads, but the blocking filter itself, as well as the focuser and etalon use screws.
Some element was probably misaligned.

I'll double check the next time I'll image the sun!
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