Thanks for the tip Geoff
so what is happening is that the guidescope thinks its tracking well but there is some movement on the main scope or connection with the camera so that the guide camera's response doesn't match what the imaging camera is seeing.
That makes sense.
I have tightened everything up but there is probably some slop somewhere in the system.
Have a look at this screenshot - this is a 5 minute exposure in R. The graph reports no movement (other than when moving from about 1 arcsecond to the zero line) above about 0.25 arc seconds. I've zoomed in 200% to capture this.
If you are right - which I strongly suspect you are - then I do need the new Lodestar so I can use the QSI with the OAG rather than with the guidescope. Still not sure why this issue has arisen lately.
Pete
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