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Even if you already have a suitable mount, $2k is not going to get you a
chromatic aberration free refractor, unless you find a used premium model,and for that price it will be a small one. Even many triplets are not
totally CA free. It comes down in the end to whether you are zero tolerance,
or willing to accept a small amount of CA.
I personally would go for a 6 or 8" Newt, much more light gathering power, and no CA, and hugely cheaper.
raymo
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