I am saying that you can not use random images off the internet to prove or disprove stars move in circles or ellipses. You don't know how the picture was taken or how it may have been processed. Your random internet images of elliptical stars are not reliable, and other random images of circular images are not reliable. Because you don't know enough about either.
Incorrect. If there are references in the image, you can see if the lens is warped or not.
No, you can not. Did you forget the picture I posted showing the blinds? There were straight lines there, and very obviously warped ones. Unless you think my blinds actually look like that.
You can not prove star trails are curved using random images without knowing how they were taken and processed. Just like my blinds image proved, straight in one part of the image does not mean straight in another. You need to understand how lenses work before you start making claims like that.
But glad to see that you gave up on proving circular star trails.
What part of my post did you misunderstand to get that conclusion? I even posted my own star trails as my own proof. Please read responses more carefully and understand them before replying.
You asked some questions about how lenses worked and I answered them.
Once more, the pictures I have taken, myself, with known lenses and properly centered show them to be circular. The math to calculate their positions also uses circular translation, and the stars are always where they are predicted to be. Moving in circular patterns.
Oh, so we can't trust random images but we have to trust a rando on the internet who posts here trying to prove that the earth is round.
Yes, because I know all the parameters. I haven't been saying we can't trust random images because people are all lying about them, I'm saying you can't trust them because you do not have all the information needed to make that judgment. I do have all that information.
You don't have to trust me. You are perfectly capable of taking your own star trail pictures if you think everyone is part of The Conspiracy and out to fool you. Like I'd lie about something anyone can verify themselves. Not my problem to deal with your trust issues.
Feel free to try, just make sure to document what lens or telescope you use, the settings and any post-processing you do. Because apparently you can't trust a random internet weirdo.