Title: Great addition to my EF 70-200 L f/4 !!!
Review: This high quality extender is a great addition to my Canon EF 70-200 L f/4 !! With a top-notch build quality and a tough, weather resistant design equal to that of their highly respected line of "L" lenses, Canon has produced a great product for its unbeatable zoom lens !! Although the 2X extender renders the A/F function useless on many Canon cameras, I found this to be a Very small drawback overall ( I prefer to manually focus under many of my shooting conditions). This extender is more suited for a low f/number lens due to the 2-stop change in brightness, but it is still VERY effective with my f/4 in normal lighting. A lightweight and fairly inexpensive way to double your focal length, while maintaining the incredible optical quality of the main lens...My backpack will always contain my 2X and 1.4X extenders !!
Is this product review negative?