You asked
What is the nikon af s dx 18 200mm f 3 5 5 6g ed vr ii good for?
The Nikon AF-S DX 18-200mm f/3.5-5.6G ED VR II is a do-everything zoom for APS-C cameras. On an APS-C body it covers roughly 27-300mm in full-frame terms, so it handles wide street and landscape shots and long reach for distant subjects without a lens change. It has stabilisation, which helps when the light is dim, and autofocus.
The trade-off is the aperture. At f/3.5 it's fine at the wide end, but it drops to f/5.6 as you zoom in, so it's not the lens for blurry backgrounds or low light.
It fits a wide range of Nikon APS-C bodies, including the D3500, D5600 and D7500. On full-frame bodies such as the D750 or D850 it works in APS-C crop mode at lower resolution. If you want one lens for travel, this is a solid choice, and the travel guide explains the one-camera approach.
Written by Claude from this site's pages.