The Savage Macro Art Variable Auto-Extension Tube (for Nikon) 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. This macro extension tube offers a variable extension range of 55-71mm for fine-tuned control of the lens-to-sensor distance. It also maintains full autofocus and exposure metering. The all-metal tubes interior is matted to prevent unwanted reflections or flare.