Good tracking error values

[Mr Thingy]

Due to only short periods without clouds in my last 2 sessions I did only a basic polar alignment using the polar scope, and didn't use the PA routines in NINA to fine tune. I wanted to see how much of the slack could be taken up by guiding and maximise imaging time.

I was getting values ~ +/- 1 arc second on both axes. The images showed no obvious distortion of the stars, though I have only a short FL scope (420 w/ 0.8 reducer), which must be pretty forgiving.

What is a reasonable tracking error? I assume it gets narrower the higher the focal length.

I also assume that the proof of the pudding is in the eating, but I wanted to know if there id any conventional wisdom on this.

-Thingy-

[scotty38]

I will try and find it but if you google the PHD2 documentation there is a section in there that specifically talks about the numbers and their relevance - if it helps.....

[scotty38]

Have a look here, easier to read than copy and paste....

https://openphdguiding.org/manual/?section=Visualization.htm