Hey guys, First time poster on OT Photo. I'm in DPReview a lot but I thought I'd give the OT photo crew a shot. I'm not new to digital photography but I got my first dSLR this year so I am new to lenses and dSLR's. I have a Nikon d40 but that's kind of irrelevant. What are the different types of lenses (in general)? I saw a $1000 macro lens thats 100mm f/2.8.... I own a 55-200 f/4.8 that cost $200.... why is the macro that much more? Can't I just shoot with mine at 100mm? I understand the aperture is better but for a couple for stops, how can that be worth that much more money... so you say "well people are just willing to pay for those f stops". okay then look at this: There's a 16-35mm f/2.8 lens selling for $1600 in this picture http://uploader.ws/upload/200806/DSC_4164b.jpg I just don't understand. My kit lens seems similar.... Where are these high prices coming from? The only spec I attribute to good glass is the focal range and f/stops.... and neither seem great in that lens Thanks in advance for your help!