[JohnH]

The latest version of PHD worked well - guiding to sub pixel accuracy with the OSS. See the attached log/chart from a run last night.

Unfortunately it was clouding over while this test was done and only the brightest stars showing by the time I was set up, I was not able to do a polar alignment (just carry/plonk) so I do not want to read to much into the results - it should be possible to do much better in better conditions - so the only odd thing I can see in the data is occasional jumps in DEC that look like big overshoots - not sure what would cause those - perhaps my balance was off perhaps it was due to poor alignment. It is still way better than it was.

It is now forecast cloudy for the next few nights so I will not be able to do more tests for a while but I will re-do the mount off test and determin the detectable min errors, then I will also re-test guiding with a good polar alignment. Then perhaps I can do some long fl imaging and stop boring you all with this thread!