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"I have the canon 70 to 300mm Nano USM, and I would like to buy a 1.4 telephoto extender, but see it will not work directly as the lens is too close to the end.
So wonder is there any reason why a extension tube would not work?"
Thanks for your question about Canon teleconverters vs. extension tubes. It's easy to get confused when comparing these two different Canon lens attachments. Some of the confusion comes from the fact that Canon's teleconverters are often called tele-extenders. That sounds like extension tubes. We'll get to that in a second.
First, yes, you can use extension tubes with your Canon EF 70-300mm Nano lens. Extension tubes have no optical lens elements. They are actually empty tubes that increase the spacing between your 70-300 lens and the camera. The better ones will maintain the automatic functions with good electronic communication between the original lens and camera body.
The newer Canon 70-300mm lens has an added glass element in the back of the lens that was designed to protect the rear elements from dust and moisture. That prevents the use of a teleconverter with the 70-300mm lens. See the photo below.
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