THe corrector plate (the only refractive part of the scope) will do some
color aberration but that amount won't be visible in the image as it is
all within the Airy disc for the error.
More important is the quality of the reflective surfaces as well as the
corrector putting the image to a poorer quality than that of a newtonian
reflector. While the Coulter scopes were often of poor quality, you can
get a really good one on occasion. Same thing with the SCT design
although Meade did tend to do the 16" a lot better than their smaller
scopes. You'll probably get a 1/8 wave accurate scope in the 16" size
which is good enough that you'll never see any real problems.
======================================

Bob, I've heard the exact opposite about Meade's 16" SCT's, in that
they are all mostly real dogs, particularly in comparison to thier
smaller SCT's. Mark D.