PHD2 drift align - intrinsic problem ??

[Skipper Billy]

I use PHD2 drift alignment but a potential problem recently occurred to me.

My guide scope and imaging scope are not quite aligned - close but not perfectly aligned.

I use my guide scope and camera for drift alignment.

Would I be better using my imaging camera and main scope for drift alignment or does it not matter?

 

 

[AKB]

AFAIK, since it's the mount that you're aligning, and not the 'scope, then it shouldn't matter.  There was some discussion elsewhere on this forum a while ago, I recall, but can't put my finger on it ATM.

The imaging camera, of course, is the one that you'd use to do a single- or multi- star alignment of the 'scope itself, to correct for cone error, and the like.

Well, that's as I see it anyway, but happy to be disabused about that.

 

[wimvb]

I agree with @AKB, as long as the guide scope isn't too far off, this shouldn't matter.

[Thalestris24]

Yeah, should be fine - that's what the PHD2 calibration is for  

Louise

[Skipper Billy]

But the guide scope isnt pointing quite where the mount 'thinks' it's pointing ??

[Thalestris24]

1 hour ago, Skipper Billy said:

But the guide scope isnt pointing quite where the mount 'thinks' it's pointing ??

Hiya

The calibration determines the relationship between where the guide scope / cam is pointing and the mount axes. Thereafter I don't think it matters much where exactly the guide scope is pointing so long as it doesn't move relative to the mount. PHD2 should give you a warning if anything isn't right.

Louise

[Skipper Billy]

Thanks Louise - I think I am over thinking it ! 

 

[newbie alert]

1 hour ago, Skipper Billy said:

Thanks Louise - I think I am over thinking it ! 

 

Judging on your guide graph when you was selling your lodestar then you have nothing to worry about Billy

[Skipper Billy]

True !  It was just a thought that flashed through my mind really. I like to understand how things work.