Canon EF Extender 1.4x II. Palm, 19 December 2014. Canon 5D Mark III, Canon EF 300mm f/4 L with Canon EF Extender 1.4x II at f/5.6 (wide open) at 1/640 hand-held at ISO 100, no lens profile used, Athentech Perfectly Clear v2.) Full resolution. It works well with the Canon EF Extender 1.4x II, making it a 420mm f/5.6. I'm rating the EF 1.4x III Extender at 4/5 Stars because of the excellence of build and the quality of the images it produces. It's a considerable improvement on the Mk II. I've dropped a star because of the decision by Canon to cripple the AF with some cameras and not others and because the RRP is slightly too high IMO. Re: 400mm DO II vs 500mm F/4 II. I've used both quite a bit. My experience suggests very similar IQ (with a slight edge to the 500) using the bare lens and the 1.4x III. Using the 2x III I have found the 400 DO II does take a noticeable IQ hit and the 500 has a pretty good edge in IQ at least wide open. Canon Extender EF 2x III: 12/2010: 5: 9: 72.0x 52.7: 325g: The world's number 1 Canon Review website with every Canon EF Lens. Read all of the reviews, see Canon has announced an upgrade on two of its popular extenders with the new Canon Extender EF 1.4x III and Extender EF 2x III. These direct replacements fe t5jx4. The review is for the item "Canon EF 2.0X III Telephoto Extender for Canon Super Telephoto Lenses (Camera)" " Works very well with 300mm f/2.8 IS L II Works extremely well with 300mm f/2.8 IS L II. You will get (2) the Canon 70-200 2.8 II + Canon Extender EF 2X III Obviously, buying the extender would be a lot cheaper and lighter than carrying around another heavy zoom. The Tamron would give me a little more reach, albeit the reviews say it's quite soft above 500mm. The Canon EF 2x III Extender mounts between your Canon EOS Digital SLR and a compatible lens (primarily Canon L Series lenses), extending the focal length of the lens by a very noticeable 2x.

canon extender ef 2x iii review