Well.. I've now got an OAG (SX-OAG) and after many months of delay caused by other demands and uncooperative weather, I got my first autoguided shot with the mount.

I knew the DSLR and the guider were not parfocal, so I accepted the inevitably poor shot and had a crack anyway.

Stacking 30 x 30 second shots with no software registration showed the movement was not discernable. Out of focus yes, but 'sharply' out of focus, not just blobs so the autoguiding is really working.

Next up: C mount extension tube and DSLR remote control for multiple long images.

nearly there!

Derek