Hello,
I ask myself a question for polar alignment:

I have a Polemaster camera on my skywatcher eq6r pro mount, a Celestron C8 and either my Asi 294mc pro in hyperstar mode or in the focus of the telescope.

my question : is it better to do the polar alignment via ekos from the Polemaster (so directly on the mount) or go through my asi 294 ?

Best

Frank

Via the polemaster, which should be perfectly fitted at the right location on the mount. There will not be any flexure nor miss-alignment from your imaging rig.

Thanks

I guess you need to check if you have at least 30' of field minimum to do the Ekos alignment. This alignment can be done with the guiding instrument too which allow to have wider field. I do alignment east to west and do it again west to east. The result is that in less than 10mn I have the mount axle close to few seconds to the pole. If you don't have enough field of view so polemaster could be better bu I am not sure it is so competitive if you have enough field.

good point.
I have enough field of view to compare the two methods.
A priori, the method from the Polemaster should be the best, but what if the telescope is not perfectly aligned on the mount (I find that the plate of the eq6r pro is not perfect and even for the vixen bar of the C8 ... a little too much flexion I find).
if the sky is discovered a little on the side of Angouleme, I will try tonight

Alignment of the scope is irrelevant. The only thing that matters is flexure. As long as the offset between the telescope and the mount is constant, then rotating the mount will lead to a good measurement of the polar alignment error. This is also true when using a guide scope instead of the main imaging scope.


Wouter