It's easy to grow attached to lenses, especially great ones. With all of the options available to us, what is the one lens in your bag that you would never sell? Why?
I'll start. I would never, EVER sell my Sigma 400mm 5.6 APO HSM Macro. Why? because it rocks. No, seriously, it rocks. It does 1:3 macro. And even though I can only use it wide open, it's TACK sharp. I also wouldn't sell it because the copy I found was only used for like 40 shots and in brand new condition.