Canon or Kenko Extension tubes

Depending on your use, even cheap $25 tubes might work. I've owned Canon tubes, Kenko, and now have a cheapie set that just sits waiting for my once every 5 years use.

The air in all of them, so far is the same, so that leaves the construction as the variable.

1. Canon tubes are build to take a beating, to use with the big whites, and lighten your pocketbook!

2. Kenko tubes are well made, plenty strong for all but the toughest usage, and reasonably priced

3. The no name tubes are cheap, poorly made, but work for light duty use, don't hang your 5 series, 7 series, or 1 series camera on one, because the mounts spring open a little and the alignment to the sensor is lost. No problem with something like a 70-200mm f/2.8 as long as you don't tripod mount the lens or camera.
 
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For what purpose? If for increased mag in macro shooting, the Kenko would be fine and less expensive. Personally, I went with the Canon tubes because I use them not for higher mag per se (I have the MP-E 65 for that), but to achieve a shorter working distance with my 600/4. I chose Canon because I trust the OEM tubes more with the weight of my 1D X hanging from them.
 
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I don't have the Canon but do have the kenko. If you have a 1 series body or plan to mount the latest and greatest body then I might opt for Canon. When I stack all 3 kenko and have a bare 6D hanging off I can see a little flex in the tube stack. If you are shooting in a downward angle, obviously, it won't put as much strain on the tube stack but I often shoot completely horizontal.
 
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I currently use 2 sets.
One is an E Bay cheapie (£7.50 for the set of three) with plastic mounts which is absolutely fine for "normal" lenses. The contacts work perfectly for AF and aperture and the plastic mounts give less play than the mounts on any of my "L" lenses.
For heavies stuff I have a more expensive set of three (£13.50 from E Bay) which I use, mainly, to shorten the minimum focus distance on my Canon 800 F5.6 and (previously) my 600 F4 L IS Mk1. Been using them for 5+ years - no issues whatsoever.
 
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For something I'd be lucky to use 2-3 times a year, my 3-set of Kenko's are perfectly fine. For someone who has a distinct preference for OEM, the Kenkos have been a solid exception.

-pw
 
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