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Stu, have you looked through a less expensive apo, like the Synta ED100 for about 1/6 of the price of the TV NP101 or one of the Vixen 4" apos for about 1/3, or a Tak 4" for less than 1/2? I wonder if the Televue betters all these scopes by such a huge margin...
Regarding the Ritchey-Chrétien design, I believe it is meant to keep the field flat and aberration free over a larger area than other designs, but in-focus star images are still the diffracted projections of the aperture along with its central obstruction, i.e., not up to the contrast of an equivalent aperture refractor.
... but this is all academic for me. I haven't had the privilege of looking through any such fine instruments. (Hey, I thought the ED80 was a really top scope, just lacking a bit in aperture.. Maybe I'll be happier if I never look through a high-end refractor. Having looked through a Nagler is still eating away at my wallet, even though I decided Naglers, type 6s anyway, are not for me.)
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