Title: High quality product
Review: The 2X II Extender by Canon approximately doubles the reach of your Canon "L" lens. I used it today to capture some American Goldfinches while attached to a Canon "L" series 70-200mm, f2.8 lens I am using. You can really reach out and "touch" the subject at 400mm. You loose a few f-stops and you need more light by adding the Extender but you make up for some of it with IS (Image Stabilization) available on a 70-200mm lense. The AF features still work as does all features on the main lense I used. This is a great accessory to make your investment in a lense do a lot more for a little money.
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