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Hi,
spacing is bang on spec at 91.5mm. I use a special adapter made by Peter Tan in Hong Kong to get my spacing bang on. I probably was not clear enough in saying that the 4 corners of the image are different - indicating collimation...Its not flare as such. It's not huge, but the misshapen stars are there nevertheless!! Because of the difference in each corner, I believe it is collimation. The long back spacing (91.5 for the Rowe versus 55mm for the MPCC) as well as the extra air spaced element in the corrector, must make collimation MUCH harder!!! At least more so than I expected....
cheers
Gary
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