http://www.nikonchat.com/nikkor-lenses-55-200mm/

What is the difference between a 55 – 200mm Nikkor lens and 18 a – 55 mm lens?
about $ 500 more or less a hundred. depending broadband and the f-stop. and if fixed or not. Seriously, you need both. 50 mm is considered normal. film of 35 mm 200 mm is 18 mm telephoto lens is wide General use … no is limited to 18. mm wide is used for interiors, landscapes, architecture (non-technical, you need a PC lens) of 50 mm is 200 mm normal everyday TV is to make the objects appear closer. But I use 200 and 300 mm for portrait and fashion. It makes my thin and sexy topics. and its af 2.8 has a good depth of field shallow. This objective is also good for the outdoors. If you really want to birding safaris and stuff I suggest you start with a 600 mm lens and go from there. So all that in mind. a 18-55mm, 17-55mm, 28-80mm short zoom lens would be a very good camera to take most of the time. you can actually take quick "grab" shots without looking through the finder. As do the paparazzi. 55-200mm 70-300mm lenses are practical for distant objects. Hope this helps. The technical part just bores me.