I'm new to foruming and all. I've been reading CS for a while now so I thought of just posting something. I have a question on whether it is advisable to get new lens. I own a D80 with kit lens, 50mm f1.4 nikkor, tamron 90mm f2.8 and a sigma 20mm f1.8. I'm going to HK next month and I was wondering if I should get another lens like a mid range zoom, something like 24 - 85mm? I'm still a student by the way and still working on my portfolio.