Fullframe Autofocus with elongated stars

[Kaban]

Hello.

When i use the full frame autofocus, the images acquirted show elongated stars along the process.
Anyway, the final focus seems to be correct. Is this normal? I guess not!

Thanks.

David Cejudo.

[Iver]

That never happens when I focus. Do you have guiding active when you focus? If yes pause the guider and see if that helps.

[Kaban]

Hello.

No. Guiding is not active.
Besides, if i get a single image just before or after focus, the image is perfectly normal with round stars!

[Dunmunro]

Hello.

No. Guiding is not active.
Besides, if i get a single image just before or after focus, the image is perfectly normal with round stars!

Is your mount polar aligned?

[Kaban]

My mount sits in an equatorial wedge very well aligned.
Even if i do not use guiding, any shot shows round stars even with long expositions.

Just before focus i usually acquire a simple image a few seconds long that looks fine.
Besides, the Full Frame autofocus uses 4 seconds shots.

Also, the camera is well aligned to the north but those elongated stars are slanted.

David Cejudo.

[Iver]

Have you checked all the connections between the camera and scope especially the focuser ? Maybe just a lose connection that flexes during auto focus.
Good luck