I haven't had this one too long (bought it used) but it's done 10 rolls of film on an F90x and I have only good things to say. Images are very sharp at middle apertures, and seem perfectly acceptable at 2.8. Haven't seen any flare problems yet, nor unwanted/unexpected distortions. Best part is the way it feels on the camera -- nicely balanced, as if really belongs there. This one is definitely a keeper. I have other Tokina Pro lenses (17, 28-80, 80-200) but I think this one is the best of the bunch, rivalled only by the 28-80. I also have Nikkor primes throughout this range (20, 24, 28, 35, MF or AF) but without having done any deliberate testing, I think only the Nikkor AF 24 is sharper.
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