Canon EF 1.4X III Telephoto Extender for Canon Super Telephoto Lenses

If you have a tele lens that is 2.0, 2.8, or 4.0 this is a must have accessory. It turns my 300mm 2.8 into a 420mm 4.0 with very little loss of sharpness and virtually no contrast loss. Version III has improved picture quality and focusing over version II. Still very slim. Can also be used with some zoom lenses (70-300 4.0-5.6) but only at the full extended range. Remember for AF to work on most Canon cameras the lens/extended combo has to have F/5.6 or greater F-stop. Manual focus can be used with lenses that end up out of this range. There is a small click lock to lock it to a lens creating a nice tight (reasonably weatherproof) seal.

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I bought this for use with my Canon 70-200mm f/4L IS lens and I am absolutely delighted with the results using this pair on my Canon 70D. There is only 1 stop loss with this extender and I can really could not detect any impact to image quality from using it (I shoot RAW and post-process with Lightroom). It adds about 1 inch to the length of the lens and some additional weight but I was still able to comfortably shoot freehand with it mounted. This is really an excellent addition to my photo gear.

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I use this in combination with my canon 70-200 f2.8 IS II with great results. whenever we go camping in the Sequoias we end up seeing bears near dusk at a distance. With this I can get good shots at f4.

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