Abbas

Okay thank you all, I'll try adjusting my focus perfectly + About collimation, my scope is a refractor so I don't need collimation right?

Although in some frames at the beginning of the shooting session the stars were fairly round, and the frame I've sent was later at the end of the session, did I have to adjust the focus after a certain period of time?

that's another frame as jpeg

this one of the frames for example, could you tell me if anything is wrong with it Darks_0011_20230418_023208.dng

Hello everyone I have been struggling with deep sky stacker for a while now The problem started when I tried to capture the North America Nebula, I took some frames (lights, darks, biases, flats) and everything was fine, I then tried to stack those frames but it says "only one frame will be stacked" how ever I tried some stuff like star threshold and I asked about it then I realized that my shutter speed was a bit high (2 seconds), so then I tried capturing with 1s of exposure and nothing's changed, the same issue is popping up, only one time it stacked some frames and the stars appeared "very" trailed, I never gave up and I tried for many nights and nothing works the same issue each time But I remembered that I had some orion constellation pictures I've captured a while ago and I stacked them and it worked but with everything was Doubled, the Orion nebula, Rigel, Betelgeuse, some other stars, everything was Doubled I guess the difference between the frames of the Orion and the frames of NGC7000 is that the first were captured using my phone normal camera, while the second were captured using an external app Note : I use my phone I don't have a dslr My equipment : Celestron SCTW-80 (other name Celestron Libra 80500 (it's a 80mm aperture and 500mm focal length telescope) and 23mm 62° eyepiece, and my phone which is Redmi 9, and a normal manual alt-az mount I'm sorry for the long description but I really need help