[Paul Haese]

I have now mounted my RC12 and TSA with cameras on my PME (see image; also cabling is now managed correctly)

I have found that guiding in X (using maxim) looks a bit like a slow sine wave peaking from +1 pixels to -1 pixels over a period of 1-1.5 minutes. The dec is rock solid and stays pretty much on the center line.

This guiding is all done in the TSA using the OAG on the QSI.

When the mount just had the TSA on board this sine wave did not seem to exist.

I did a PEC recently and applied that, but wonder if I got it the right way around. PEC seems to be around 0.9 arc seconds at present. Using precision PEC and applied it shows this figure in the sky

I have the mount balanced perfectly, with no imbalance at any point of the sky.

I think this "sine wave guiding error" is the cause of the slightly elongated stars in my RC images, but I am not discounting flexure and have ordered a new STi camera for the moag (guiding through the internal guide chip is problematic and produces all sorts of corrections).

Would the spring plungers need adjustment? I think there is currently around 37kg on the mount. There appears to be some slight movement in RA (in rotation of the axis) when I put torque on the counter weight bar. I mean very slight movement, nothing like what I had before.

Guide settings are aggression 5 in X 4 in Y (I have tried a few other settings but nothing really makes a lot fo difference). Other settings are default.

The bottom line is that the TSA images have round stars but the RC12 images don't. Although the TSA star images are slightly bigger than before. The sign wave guiding is my main concern here though.

Any suggestions will be considered.