Good luck with this one. You might save it for those times when you don't want to endanger your other lenses. I had two Tokina zoom lenses, and they both sucked pretty badly. One had fungus (70-210 zoom) and my friend had an identical copy that also had fungus. The other (35-70 zoom) came out of focus as I tripped the shutter. The aperture lever somehow knocked the focus ring enough to give me crappy pictures. It was a brand new lens also. Oh, and I had yet another Tokina, a 28mm 2.8 that had horrific diffraction at all apertures. You get what you pay for I guess.