Je viens de tester ma nouvelle Askar 50p et j’ai un problème de halo autour des étoiles. Y-aurait-il une solution pour résoudre ce problème?
📷 WhatsApp Image 2026-05-14 at 11.46.33.jpeg
New Askar 50p telescope: solving star halo problems
What camera and filter, if any, did you use?
J’utilise une 533 MC pro. Pour cette photo je n’avais pas de filtre.
You should always use an UV/IR filter in front of this camera’s sensor as their windows are just AR treated. The glow surrounding the brighter stars is just a reflection of the out-of-focus IR light from this doublet lens. Your colors are also affected by the IR leak.
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If I use a different filter, such as a narrowband filter, will the problem go away?
Wandrille VINCENT · May 14, 2026, 02:30 PM
If I use a different filter, such as a narrowband filter, will the problem go away?
Yes, it will do. Any filter which cuts out UV and IR will be fine. This should be the case for narrowband filters as well. You can always look at the bandpasses (if provided) for a particular filter to be sure.
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So the problem is just because I don't have a filter?
Essentially yes. Like Andrea said, the sensor window on this particular camera (among others) doesn't cut out UV and IR. So without a filter the camera sensor picks up those wavelengths. As the refractor isn't corrected for such wavelengths, they will give you the bloated stars.
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