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This extender has been re-designed optically and offers excellent performance with compatible EF lenses (same as the Extender EF 1.4x II). It features a new seven-element design, and same weather-resistant design and anti-reflection internal construction as the new EF 1.4x II. The EF 2x II doubles the focal length of any lens it's mounted to, and reduces its effective aperture by two stops. With the EF 2x II, AF is possible with any EOS body if the lens has an f/2.8 or faster maximum aperture, and compatible Image Stabilization lenses maintain the IS feature when used with any current EOS camera.
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Technical Details
- Telephoto extender designed to double Canon EF lens focal length- Ideal for shooting close-ups from a distance at sporting events
- Weather-resistant and anti-reflective internal construction
- Maintains autofocus with any EOD body with f/2.8 or faster aperture
- Measures 2.8 inches in diameter and 2.3 inches long; weighs 9.3 ounces
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By T. Chocklett (Roanoke, Virginia)
This is a must to get closer to your subject. I haven't noticed any loss of picture quality. Very slight if any.
By T. Schreier (Bettendorf, Iowa)
I just received it this weekend, so I don't have much experiece with it. My only complaint is in the features, not the performance. It would be better if the autofocus worked with more lenses. More specifically, the Canon 100-400 L Series (4.5-5.6). Otherwise it works great. I'm able to shoot much closer without spending $12,000 for an 800mm lens.
By Mike (Glendale, CA United States)
I use this with my 70-200mm 2.8 IS lens. I get "acceptable" results, because I lose a little in sharpness and a couple of stops, but it is a much cheaper solution than buying a 400mm dedicated. For the price this is a good value.
By J. LEFEVER
I used it exclusively on my 1DsmkII with the Canon 70-200mm f/2.8 L IS for my month in Jerusalem - originally it was joined to a 5DmkII with the Canon 180 mm f/3.5 L macro lens - also superb image quality. I was very happy about that.
Only two problems actually (and they are not problems, just restrictions) and that is the loss of stops (on the 2.8 70-200 lens the widest I could open the aperture was 5.6 and on the 3.5 it was a bit smaller) - tough when shooting churches and darker situations, which I do. The other restriction is I could only use it with those two lenses out of my collection. It does not fit with any glass that is flush on the back end, such as the 85mm L 1.2 or the 35mm L 1.4 or the 24-70mm L 2.8, or the 14mm, or the 24mm.... etc. Mainly made for telephotos so no getting creative with it with the medium and short lenses.
I think I would have given it 5 stars if Canon could make it so as to keep the lens f/stop speed at the widest of the lens being used (in my case, 2.8 and 3.5 respectively).
With that said, I thought many times on this trip, that it was a great purchase and I am glad for having made it - loved the extra extension and shooting with a smaller lens at a max 400mm length. I am leaving it configured with my 1DsmkII and the 70-200 zoom. I like the results that much.
Is it less contrasty? less sharp? Well, not pixel peeping here, I am only asking - did I get the shot or not. And with that I can say YES! (many times in an area sensitive to picture taking). I am glad to have it in my lens case.
By K. Garrison (L.E. California)
Go to the Canon web site make sure the 2x will work with your lenses. I use it on my 70-200 2.8/fL IS USM and although you lose 2 stops, its a lot cheaper than buying a 400mm lens not to mention a lot lighter. For those that complained about losing their AF all I have to say is learn to read and learn focus manually. You will be a much better photographer for it.
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