Kenko Teleplus PRO 300 AF 1.4x times converter
    This great quality teleconverter fills a niche of auto-focus teleconverters for Nikon auto-focus lenses.
Currently, Nikon manufactures teleconverters for its AF-S and AF-I lens line-up only.
    Kenko Automatic Extension Tube Set DG
    This Auto focus enabled extention rings allow for closer focusing, thus providing macro capabilities.

You can use it on any auto focus lens providing this rings are compatible with your brand of camera.
The lens will focus and meter correctly. However, there will be a loss of light of up to 2 stops,
depending on what combination of rings is being used.

There are 3 sizes: 12mm, 20mm and 36mm. They can be used individually or in any combination.