Macro Extension Tube Lens Ring for Nikon D300 D50, D70s, D80, D7100,D7000, D5200, D5100, D5000, D3200, D3100 There are no electrical contacts in the extension tubes. Exposure has to be adjusted manually. The more tubes you add, the closer the focus and the greater the magnification. This Macro Extension Tube set does not preserve the automatic diagrapic. Composed of 3 extension tubes - 9mm, 16mm, 30mm and male and female adapters