[JohnH]

After a long layoff (the ST2000 developed nasty banding and it had to go back to the US to have a capacitor changed, then it was summer - then work, family poor w/x etc got in the way) I finally got my kit out again this week (!) and took this shot.

I used the GSO RC10 fitted with an AP CCD67 reducer and the ST2000 with a CFW10 and I cannot seem to get the spacing/focus quite right. Please have a look at the star shapes in the corners two are ok and 2 are not. I think this is a problem with orthagonality but it could be the FR out of true or the focuser or collimation or some horrid combination of all of those. I am at a bit of a loss as to how to debug this issue and would welcome some hints. I have a moonlite focuser that allows the FR to sit in a range of spacings but am not sure if I can set tilt accurately - perhaps it is better to screw the FR to the nosepiece with the right spacing.

Any and all feedback is welcome