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I can confirm that mine does the same. It is an older LX200 10" f6.3 (classic) so no ACF. In prime focus with t-adapter and 450D I have lovely comets all around the edges. They look like arrow heads with bubble tails all pointing into the center. When I use the Meade f6.3 focal reducer they look like what you have with the pac-men, only they extend about 50% into the center. The reducer is called a "corrector" and I suspect it works on an f10 scope, but it is over-correcting on mine. Probably works OK with a smaller CCD, but that is like cropping a larger sensor anyway... With the f3.3 reducer I get VERY long spikes and it is un-usable. haha good for a laugh though.
I have found one fellow who uses a MPCC corrector on his f6.3 to good effect so I'm going to try it. I've got the corrector already, but it needs a 2" eyepiece holder so I've got a JMI EV-1cM focuser clearing customs as we speak. (Lets hope it even comes to focus haha. Can't find much info on a configuration like this so just went and ordered it...)
Mark.
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