Well right now in my set up I have a 10-24mm Tamron, the nifty fifty, and a 80-200mm 2.8 Nikon. The Tamron is the only lens I have thats not FX format, its really not the best lens, towards the edges of the lens it has like a prism effect, where the image starts to break up and you can see the red, green, and blue parts of the image. Well you can see here. Anyways I want to replace it with a FX format lens, I would like one as wide as possible, but I want to stay under $1000, and with that budget I don't think I will get one with the range of the Tamron I have now. Even a prime lens would be ok. What would you guys suggest?