Extention tubes for Nikon F-mount Autofocus works!

12mm, 20mm, and 36mm extension tubes for Nikon F-Mount. For macro or micro photos f9r EXTREME CLOSE UP HIGH END GRAPHICS AND IMAGES.. I used to document jewlery and watches.. Autofocus worked with all my lenses but I could not get it a Nikon 17-55mm 2.8's aperture to close past f 2.8... but everything else was fine... I tried to return to Amazon but missed the 2 week deadline from supplier... Also tried two diff sets of the JJC brand and both broke in less than 24hours...