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Hi Arif,
A field flattener will definantly help.
Also if possible, can you try and rotate the camera in the focuser and see if the star trails change direction?
Also as you are unguided, some trails will be promenent.
Also you can get some slight movement if your mount is not very stable, or there is high wind.
My suggestion is to see if you can get a Field Flattener which may solve some of your issues, but if it is a mount problem then you will need to investigate the stability of the mount (tripod legs etc).
After that possibly look into some sort of guiding system, if your mount can handle it.
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