Reviews and Problems with Canon EF12 II Extension Tube
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Good Option if you only need one
Product User, B&H Photo
5 March 2015
Excerpt: If you do not want a set of extension tubes, this is the only way to get just one.The body of the tube is plastic and the bayonet ends are metal.I have a set of Kenko extension tubes, and for all intensive purposes, I can't spot any striking visual differences between this 12mm Canon tube and the Kenko 12mm tube.This Canon tube does seem to engage more smoothly and it feels like there is less "slop" or play.
Excerpt: I wanted to do some macro photography without buying a new lens. Good solid build and fastens to my camera and lens with a snug firm fit. Not to tight and definitely not loose. Work great with my 70-300 Tamron no wiggle at all and well with my 17-50 Tamron but at the upper end of the zoom range. On my 10-20mm the focus distance is just to close to the glass to make it worth while and at the 10mm the focus is inside the glass.
Excerpt: the canon extension tube really gets you so much closer to smaller subjects without having to buy an expensive macro lens. I'm using it with my canon 85mm 1.8 lens and the auto focus works well. There is some vignetting but it could be due to the small depth of field. In the reviews I read it was useable with most lens but when I tried to use it on my canon EF 35mm 1.4 I could not get it to focus at all.
Excerpt: I use this with a Canon 50 mm 1.4 lens and it is great. I have a 100 mm Canon Macro but it is big and heavy. This fits easily into my vacation camera bag that holds only the 6D, 24-105 mm lens, a flash, small tripod, the 50mm and now the Extension Tube.
Excerpt: I had another brand of extention tube and recently purchased the Sigma 50mm 1.4 Art lens. The other brand of extention tube did not work because the sigma (as well as other lenses) is rear focus which hit some of the structure of the tube. The Canon tube works perfect and now I do not have to carry a macro lense while traveling.