It a lot better but I'm not totally happy yet to be honest. I think it's still down to collimation. I'm getting 2 sets of parallel spikes on my stars, and although that can be a focus issue, I'm running autofocus routines and the HFR is as small as possible, so it's either collimation (or perhaps tilt). It's a bit of a bitch because the collimation mark on the secondary isnt round or small, rather it's an oval shape, and there is some room for interpretation of it's centre point. I'm going to adjust it today, and see how it's looks. If I could get a measurement of the secondary centre spot, I would remark it myself. I'll not derail this thread though