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Six months - used equipment that tests to specs
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The Nikon Extension Tube Set PK-11, PK-12, PK-13 provide 8mm, 14mm, and 27.5mm of additional extension to mounted lenses respectively. By mounting between the lens and the camera, this extension allows lenses to focus closer than their normal minimum distance, allowing greater macro magnification with practically any Nikon F-mount lens. These tubes retain automatic (mechanical) aperture functions as well as meter coupling on Nikon cameras using the AI variant of the Nikon F-mount.