-up ring extension tube for Material: Metal,Not plastic or normal alloy It consists of three extension tubes (9mm 16mm 30mm) By various combinations of the three tubes,It is possible to freely adjust the magnification and focus range. Because it is not include an optical component in the tube,Without degrading the photographic ,Macro photography which utilize the lens original performance is possible. Lens to be used: F-mount lens Camera to be used: camera body Applicable models: D3X,D3,D700,D300 D90,D80,D60,D50,D40,D40x D70,D70s D100,D200 D2Xs,D2X,D2Hs, D1,D1H,D1X No electronic contacts,Manual focus only The magnification will differ depending on the lens. set content:1 x Extension tube Note:Light and different displays may cause the color of the item in the a little different from the real thing.The measurement allowed error is +/-1-3 cm.