Simply fit a Tamron tele-converter between the lens and the camera body. This increases the focal length and gives you extended telephoto capabilities so you can take photos with greater magnification from the same camera position.
Tamron's AF tele-converters are compatible with most AF (auto-focus) and auto-exposure cameras.
Comments about Tamron AF 2X Teleconverter for Nikon AF Lenses:
Used it twice, took it back....Don't try to use it with your silent wave motor lenses. The non swm lenses, it does work ok with, but watch your f, as it WILL double it and you MUST compensate for it with our shutter speed or aperature settings. Ritz Camera Associate suggested against it's use for MY purposes, but I thought I knew better, so if they recommend something, wheter it be pro or con, heed the advice if you trust your Ritz associate. Used it on a D-80