Hi Richard, thanks for the input
Yes, I'm using a flattener. Also there's an IDAS filter screwed in between the camera and flattener, so maybe that's where CCD tilt is coming from?
My OTA weighs 6 kilos and the camera is only about 1kg, ad a bit fot autoguider and flattener and it's probably around 8 kg all up.
Cheers
AC