I want to pick up a faster lens to experiment with on my D3100.
I've considered the Sigma 28-105mm 2.8-4.0, Tamron 28-105mm 2.8, Nikkor 105mm 2.5, Nikkor Q 135mm 2.8, among others. I'm interested in (specific) lens suggestions, including what to stay away from.
I have three lenses; Nikon (kit)...