My take on macro extension tubes review

This is my review of the auto focus macro extension tubes I found on amazon at:
https://www.amazon.ca/Xit-XTETN-Focus-Extension-Cameras/dp/B00AEEDRFM/ref=sr_1_10?ie=UTF8&qid=1467646230&sr=8-10&keywords=nikon+extension+tubes

or

https://www.amazon.com/Xit-XTETN-Focus-Extension-Cameras/dp/B00AEEDRFM/ref=sr_1_1?ie=UTF8&qid=1467646296&sr=8-1&keywords=Xit+XTETN+Auto+Focus+Macro+Extension+Tube+Set+for+Nikon+SLR+Cameras%2C+Black

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