The RCX and the ACF are a different machine to the older version of SCT's.
They do produce a flatter field than the older versions, and the large frame KAF11002 CCD's work well with them.
I remember an image comparison using an RCX and the RC on "Cloudynights" some time ago, and you could just start to notice the stars on the very edge were just a little larger than the RC.
Theo
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