2 of 2 people found the following review helpful
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This review is from: Canon 9198A001 EF 12 II Extension Tube (Camera)
What a great device and having the electrical contacts so that your lens continues to do its thing is marvellous. So far I have only tried it on a prime 35mm lens and was quite taken back by the magnification and how sharp the image was. Definitely need to turn off Auto Focus.