A:AnswerThe D5000 usually comes with a 18-55mm lens. This lens is good for casual shooting...landscapes...close up portrait.
The 55-200mm lens will be good for creating depth of field (DOF) effect from long distance. Good for general sports shots and nature. The 55-200mm picks up where the 18-55mm leaves off and will be a very good addition to your lens inventory.
A:AnswerIt would be a very good idea if you visit our website in order for you try our lens simulator, it will help you choose the lens that you need.
http://www.nikonusa.com/Nikon-Products/Camera-Lenses/index.page#c54-CID-1296509109099-tab-2
A:AnswerYes, the 55-200 will work with the D90.
DX refers to the camera sensor size the lens will work with. Your D90 is a DX sensor camera and almost all Nikon lenses will work with the camera, with some limitations.
A:AnswerAside from the obvious extra focal length - 300mm compared to 200mm - the incorporation of VR gives the 70-300 a huge advantage over the non-VR 55-200. VR stands for Vibration Reduction. It is Nikon's version of image stabilization. This will help prevent camera shake, most evident when shooting at longer focal length, therefore getting you sharper pictures.
A:AnswerThe lenses will fit on the camera, but will not meter or focus. Plus, some lenses may contact the viewfinder which may damage the D3100. Such a hassle it is not worth using in my opinion.