I'm looking to buy a nice wide angle lens in the upcoming month. I've been browsing Amazon on the daily and when I have time- some reviews. My budget is up to/around 900$. I really like the Nikon 14-24mm zoom wide angle, but it is on the pricier side. I was wondering if there were any just as good with possibly a zoom (and auto-focus for a d40)? I've considered Sigma, but after purchasing a fisheye from them- I was not completely satisfied for the quality. If you know of any please let me know!! Thank you!!