New lens for d3100 fx compatable...
I'm sure this question has been asked many times but I'm going to ask it again
I currently have a d3100,18-55vr and 35 1.8. Although I love this combo I find I often shoot in very dim light and im a ambient light sorta guy so I'm after a d600 in the new year. Before I do this I want to get a few fx lenses the 50 1.8 is a must as I love the 35 on my crop body but the other it's a relatively cheap fast zoom.(mid range zoom, or tele zoom) I'm aware they are few and far between but are they any you know of, the limiting factor of this is I would love one with a focus motor built in as I plan on selling the 3100 and get a v1 with the f mount adaptor for a "cheap" tele option with my lenses.
any help greatly appriciated