[peter_4059 (Peter)]

Hi Jon,

I've just made a similar change to my setup, moving from guiding through a 250mm fl guidescope to an OAG on the SN10. The fl of the SN10 is 1150mm (with the paracor fitted).

Using the guidescope, my guider image scale was 3.09 arc seconds per pixel with the ASI120MM guide camera binning 1x1.
With the OAG on the SN10 I now have an image scale of 1.35 arc seconds per pixel with the ASI120MM camera binned at 2x2.

I haven't had a lot time with the OAG to trial guide settings and the Zfilter guide algorithm has just been updated in the latest version of PHD2 however I'm seeing a similar RMS value in terms of arc seconds and slightly lower peak errors so far with the OAG.

I've included a few screen shots from my PHD logs below - the first three are with the guidescope and the last three are the OAG.

Peter