I'm still working with the kit lens for my Canon XS. I'm still new at all this and it takes good pictures and all that, but it gives me limited options on what I can photo really. I want to get a new lens that's quite versatile. I was looking at the 55-250mm f/4-5.6Telephoto Zoom Lens cause it is $299.00, but I also see that the F# is not all that low. How much will that limit me? Would I be better off getting something like the 50mm f/1.4 EF USM Telephoto Lens for $579.00?