The Savage Macro Art Extension Tube for Nikon F Mount is an exclusive accessory for DSLR macro photography that combines the three most common automatic extension tubes into one integrated range. Conveniently adjust magnification strength without changing tubes, to proficiently capture fine detail with ease. Works with Nikon AF Series Lenses. Works well with the Macro Art Adjustable Dual Arm LED Light accessory. The tube offers a variable extension range of 40-56mm for fine-tuned control of the lens-to-sensor distance and also maintains autofocus and exposure metering capabilities via the integrated gold-plated contacts. The bayonet mounts are made of aluminum alloy for durability and accurate mounting of the lens. Shortens Minimum Focus of LensGreater Magnification for Macro ShootingVariable Extension Adjustment: 55-71mmMaintains Autofocus and ExposureInternal Matting Reduces ReflectionsGold-Plated Contacts, Copper BayonetThe variable extension ranges from 55-71mm which enables fine-tuning of the lens-to-camera distance for dialing in different magnifications and focusing distances. The extension ring also features index markings for precise and repeatable results. By extending the distance of the lens from the camera, greater magnifications and shorter focusing distances can be achieved for macro shooting. This adapter is designed for Nikon F-mount lenses, including G-type lenses, and the gold-plated contacts maintain autofocus and exposure capabilities. It has an all-metal construction with copper alloy bayonets ensures durability and consistency. Additionally, the all-metal tube has a matted interior to prevent reflections.