mhammady wrote: IMO this could be one of three possibilities (as it happened to me before), (1) you are not physically tracking, i mean you set tracking to ON and see position change, but the mount is not moving as it was ordered, or (2) you are don't have good polar alignment and the tracking is way off course, or (3) tracking for stars is not sidereal.

Technically, if the polar alignment is accurate, and the mount is tracking good (either on its own or controlled by ekos), you should see your target standstill, regardless of what you are doing with your camera. Guiding is for minor correction for astrophotography, but here you are just checking for fucus for 2-sec shots. You should have the stars stationary for a some time.