I'm relatively new to the
Joe
Ahh yes, now I look at it again, it is indeed symmetric through out the image.
Typically, optical systems are designed to correct aberrations in focus. Since you are getting nice images I would not be concerned how it looks out of focus. Your collimation appears spot on.JosephS wrote: ↑Sun Oct 29, 2023 11:10 pm Thank you all for your responses...I should have been clearer about the image posted.
This was a totally de-focused image with intent on collimation.
I'm using a Celestron 9.25 HD EDGE 0.7 reducer/OAG/Moonlite Focuser/Filter wheel (in this image L filter)/and ZWO ASI2600.
I am getting round stars when focused and capturing some nice images so not a back focus problem, but I was concerned about the radial degradation of collimation as I went out to the periphery. Do other folks see the same aberration with their collimation? I was under the impression this was less likely to be seen with Celestron HD Edge model compared to Celestron Advanced VX models
Again thanks again for everyone's thoughts,
Joe
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