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Star halos are prolonged backward. What is causing this, and how to fix it.  |
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What caused this: Collimation, lack of. How to fix it: Collimate the scope. |
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Without any information about your rig I can only guess that it's a combination of off axis aberration and possibly some drift error.
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Ed I agree with Andrea that collimation is the culprit. Double check it and try again…
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You can control it through camera settings and shooting techniques that suit your artistic intent. Join Poor Bunny on his arduous journey to freedom. Every step you take is a hope for this little rabbit's survival.
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Yes, confirming that the collimation is correct is the first place to start. Based on the example it certainly looks like the collimation is off.
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could be a combination of lacking collimation and deviation from optimal back focus cheers Gernot |
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To the OP. As you can see there there are a lot of possibilities. Without more information we're all just guessing. Please describe your optics, is the frame from the center or a corner, what camera and accessories are you using. This is basic information and should be included in any post like this.
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A quick perusal of the OP's gallery would answer those questions, wouldn't it?
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Come on andrea, it's common curtesy to provide the basic information needed for us to properly evaluate the image. Why should the burden be placed everyone else to go to the page, figure out which image is being referenced, zoom in and find the field and then check the imaging stats? Even just providing a link to the image would have been very helpful.
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andrea tasselli: Not really. They could be testing out a new scope or camera and certainly don't know where in the frame it is. Rather than having a bunch of people spending time trying to deduce the info from looking at a bunch of images to see if they have more than one scope/camera, if the OP wants useful help, providing that information will get a better answer more quickly |
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To the OP: Notwithstanding the last few posts, if you collimate your scope I’m confident that you’ll find a remarkable improvement in your stars. ✨ Sometimes additional information is helpful as noted above but your example image is enough to get you started down the right path.  |
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I dont mean to create brawl here  thank you people for posting regardless of post contents. Btw, it is not my image so i cant provide details. These deformed stars are everywhere in the image. Found a culprit already. |
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Ed, don't leave me hanging on… What was the culprit? Thanks and CS Tim |
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Tim Ray: Hi Tim, the image is my friend's. I asked him to send me over the telescope for collimation. I found small bulge of flocking material covering the focuser tube. I collimated and cut iff this bulge. Now waiting to bring it under the sky if it is okay. |
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That stray piece of flocking will cause it. I am happy it is such an easy fix! Congrats! Clear Skies and good hunting! Tim |
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ed bat: Good find on the obstruction in the light path. How was the collimation when you checked it? Let us know how tings turn out. |
