Thank you Greg. It took a few iterations to get it right. I won't be adjusting the spacing at this stage, but CCD Inspector consistently indicates that my CFF corrector slightly overcorrects field curvature at the current spacing, so that is why I think I may be a tiny bit off the perfect spacing.
Stars are nicely round though to my eye in the recent test image; it would be silly if I complained about current star shapes
I would be VERY happy to test either KAF 16200 or KAF 16803, just need to find a donor, or perhaps if things go well, I just wait patiently a few years for a Santa to accumulate sufficient funds
