Yesterday I picked-up a used Canon EF 2x II Extender to use on my Canon EF 70-200mm f/2.8L USM. This topic is a review of these two items, and how they work together, as promised in a previous post (Referenced Here). The pictures were originally going to be the full blown untouched originals, however some of those images were over 5 Mb in weight, so they have been downsized to a long-edge of 1600 pixels. These images are large enough that you should still be able to form your own opinions as to how well these two items work together. I am not going to cover the specs on the items, as they can be referenced in many places. Below the are linkes to the Canon Website: Canon EF 70-200mm f/2.8L USM Canon EF 2x II Extender Here are the items that were tested: All pictures except the very last one, as designated were taken on the Canon EOS 5D 12.8 Mega-pixel Full Frame camera, Below are the steps I took and the resulting images, they are not cropped and untouched, with exception of the watermark and the white balance of the image taken with the Canon EOS 30D (adjusted to match the 5D white balance).