Here tips for all D90 + 18-200mm promoted:
1) Buy the book for D800 Camera "(Benno Hessler)
2.) Buy from a dealer with a D800 replacement warranty in focus error (Ser. No. Early December 2012 6084xxx) with a 28-300mm VR lens.
3.) Put the theory of the book into practice and ...
4.) ... you will be amazed !!!
Nikon AF-S 24-120mm 1: 4G ED VR Lens Nikon AF-S 28-300mm or 1: 3.5-5.6G ED VR lens has long been the question. The second option (extended zoom range) has prevailed (better quality track) against former and I was not disappointed. I want to travel just do not change!
Of course you can see - if you on the screen (at 1: 1) searches - optical loss at the corners, but that is relevant for each very ambitious amateur photographers not work in practice. The differences in landscaping comparison shots with 50mm (at 300) with the excellent Nikon AF-S Nikkor 50mm 1: 1.4 g Lens (with optimal aperture 8.0), 20 x are on a picture (for example) not 15cm recognizable.
In retrospect, I have invested a lot of time in the Lens Testergenisse on universally known homepages, which are certainly technically correct, but that is in many cases criticism at the highest level and in practice for most of no importance.
Nikon knows very well why "the market" for Nikon lenses always paid a slightly higher price. The brand alone is - over a longer period - for a higher price not!
D800 with Nikon AF-S 28-300mm: Christmas sharp, low light, without flash, slow shutter speeds ... and ... great pictures. As often formulated: When viewing the images amazement is often difficult to conceal :-) "!