Summary: If there were other options for a 12-24mm lens, I'd rate this one lower. I just returned from a trip taking about 2,000 photos. This is an excellent lens for interiors of large churches, facades and expansive landscapes. But, on my D70 I often could not get it to auto-focus in order to take the shot. I missed a number of great shots because of this. It might be an issue with my camera, but my 28-300mm Tamron had no problems.
Summary: Rec'd as a gift i was looking at rec'ing a Nikon lens and when i rec'd this lens i thought oh no. To my surprise this 'so far so good'! I have only had it for 1 month and i'm shooting with it alot - it's great so far!