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Its a very nice lens and found it at least matched my 200 when both lenses were set to f2.8 (i.e its sharp at that aperture!). The cosmetic/optical/mechanical operation appear excellent as far as I can tell. My only comment is the hood has a bit of velcro attached but that can problably be removed without damaging the hood.
I have now got my mind set on a 70-200 2.8 because I want something a bit more convenient for daytime use (but it will still be used for astrophotography). I expect to trade some optical quality for this, but I already have good 100 and 200 primes.
Terry
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