Canon EF 2.0X III Telephoto Extender for Canon Super Telephoto Lenses

I got this to pair with my 70-200mm F/2.8 IS II since I needed a bit more reach, and didn't want to spring for a 300mm or 400mm lens. I'm extremely happy with it, and have to say that on a high quality lens, like the 70-200/2.8 IS II, there is hardly any loss of functionality at all. Yes, you do lose two stops, but getting a 400mm F/5.6 is not bad at all, and the 4 stops of the IS on the IS II certainly helps a lot. And these days, with the ability to shoot high ISOs without much noise (such as on the 5D3), it's not an issue getting clear shots at 1/500s or faster during the day. There is some SLIGHT image degradation, to be expected, but it is not noticeable at all unless you are seriously pixel peeping. Only at 100% crops would you be able to tell the difference, and the gain from the extra focal length far outweighs the slight loss in image quality. You do also get slower autofocus, again, because of the reduced effective aperture size (less light passing through, so it's harder for your camera to detect focus). The 70-200/2.8 IS II has extremely quick autofocus to begin with, so the reduced speed is not too bad. On slower autofocus lenses (such as if you use this extender for macro work, like on the 180mm F/3.5L Macro), the autofocus is nearly downright impossible and you may just be better off using full time manual focus. You also won't be able to use all the focus points that you're used to using, since you'll only be able to use the points that respond to f/5.6 or slower with a F/2.8 lens. On the 5D3, this means only the center rectangle of points (about 21 cross type points). The 1DS3 and 1DX give you a bit more focus point options at f/5.6. And on lower end cameras, you may be only able to use your center AF point. On slower lenses, such as f/4 or slower, you may be limited to manual focus only. That's why I really only recommend using a 2x extender on an f/2.8 lens. On slower lenses, you're better off using a 1.4x extender. The compact size and relatively light weight of the 2x extender makes it a must-bring any time I bring my 70-200 outdoors. Plus it gives me the flexibility of having either a 70-200/2.8 or a 140-400/5.6 at any time I want. It's especially great to use for wildlife (especially birds and other animals) and sports, if you're shooting during the day. For anything more serious, or in lower light, you'll need to spring for a 300/2.8 or 400/2.8, which are prohibitively expensive unless you're using it regularly for your full time job.

Being used until now. Quality is awesome as always from canon. Automatically focus. Images come out sharp and crisp. Color is perfect. Easy to use.

This Extender works very well! What you must realize is that the auto focus works on some and not all lenses. It's not fair to give it a 1 star rating because of the compatibility, although Canon isn't very clear and actually misleading. I have used this extender with my 70-200mm 2.8 MKII lens and it is surprisingly sharp! I say this, but I understand that adding this Extender (or any Extender) you will loose some sharpness and also F stops. From the research that I did, and my personal results, this extender work much better with MKII lenses. The results at 400mm are very exceptable when stopped down. If your looking for outstanding sharpness and fast apertures, the solution would be a $7,000 dollar option. I recommend this extender to anyone with a 2.8L series lens, in some cases, the 1.4X III is sharpness is very important for what your doing.

I like this product a lot. For a drop in the bucket, you can effectively double the focal length of some of your white bodied canon L series lenses (I'm pairing it with an EF 70-200mm f2,8L IS USM). IQ takes a hard hit on the corners but is still decent in the center. AF works flawlessly so long as you had a sufficiently large aperture on the lens you're starting with (as this teleconverter brings the lens it's attached to two stops lower). Contrast also takes a slight hit. That said, the better the lens you pair this with, the better your results will be. I'm pleased enough with the product that I'm currently trying to figure out how to finance a 600 mm Canon lens instead of using it as a stopgap while I put together funding for a 400 mm Canon prime. Back to the way it's built: if you've ever owned an L series lens, you know the tolerances are very tight and that fit and finish is excellent. Indeed, often the easiest way to determine if a Canon professional or prosumer DSLR body has an L lens attached is to grasp the camera and lens in different hands and see if there's any motion or wiggle. If it wiggles, either you've got an old L lens that needs some work or you're using a non L lens. When connecting the teleconverter to my camera (5D Mark III), the teleconverter wiggles, and the lens on the other end of it wiggles with respect to the teleconverter. In conclusion: great product that solves many problems but lacks the fit and finish of the tools it's designed to function with.

Works fine on my 70-200 lens, though it does drags a bit, focus is better, when the image is acquired, closer shots are much better than a distant shots. Considering, I had to manually focus the ver II, this is a god send. You will need to use your tripod of course. That will be my next big purchase, a strong tripod., for now, I ordered and tripod sack, attaches to each leg and you can put something heavy in it to better stabilize the tripod, if that works, I can put off buying an expensive tripod for a time... Took pictures of an eagles nest from across a lake, was full out on the lens, on a tripod, when the wind blew, the tripod shook just slightly, then to compensate, I took several burst of photo's, which dispite the wind, got a couple of keepers, with this I had to slow the shutter speed down, increased the ISO, as the eagle wasn't moving, it gave me better focused image. The 2x III, is better than Ver II, Focus is somewhat fasters, and images are more in focus.

I have a 5D Mark II and use it with my 100-400 telephoto lens. In normal operating mode it does not allow autofocus to work. Looking at the camera manual, I found out that autofocus does not work with a lens that has a maximum f of 8 or greater, the lens is a f4.5-5.6 and with this extender it makes it 9-11.2 which is less then 8 (remember with fstop larger numbers are smaller aperture). There is a work around this: Set your camera to live mode (press the button on the upper left side of the back of the camera), press the AF-Drive button (top right of the camera) and make sure the live option is selected. I do not know if this works with live face mode. Now point the camera at what you want to focus on and press the AF-ON button (top right on the back of the camera) until the box turns green. This will set your focus, it looks like it keeps this focus until you change it, even when you go back to normal (through the viewfinder) mode. Don't touch the focus ring on the lens! This is clumsy and no good for moving targets, but it will get you into focus, for at least a little while.

The quality is diminished a little bit using this, but I can't complain about it. I photographed Yellowstone National Park in August of '13, and used my 70-200 2.8 IS. So it became a 140-400 f/5.6. When I brought the RAWs into Lightroom and Photoshop, I could tell a very slight difference in both sharpness and contrast. I ran a denoise filter and adjusted with curves, and I honestly feel like my photograph is 98% as good as the Canon 400mm 5.6. This will not attach to a 100L macro, for that you'll need the 1.4 extender, but this will attach to a 180L macro, and it does not effect the minimum focusing distance. I had a 360mm f/7.1 with a 15 inch focus distance. At 7.1, it was still way too shallow! :) That's a great thing. I mainly photograph weddings, and found myself using this on a balcony in a large cathedral. It was a little difficult as I was stopped down to 5.6, but I shoot on a 5dm3, and was able to use a high ISO, so it wasn't too bad. I would have rather have had a 300 2.8, or even a 300 f/4, but the 5d3 does great with noise, so all the photos were fine. All that to say, if you're using this to shoot outside, you'll be totally fine. I still kept my ISO outside at 400 so I could raise my shutter speed. I noticed I was at 1/125 when it was cloudy, and that was just too slow for during the daytime. I still use this at weddings and other events, and with a little editing, you won't have any issues getting a good, usable photograph with this. I would be concerned to use this indoors, (like at a graduation or concert) unless you're experienced in that genre. But if you can't afford a 300 2.8, and need the reach, this'll help you out far better than 200mm and trying to crop it in tight. I'd much rather have 400mm with high ISO, and slightly lowered sharpness than 200mm, and cropped to 1/3 of it's original size.

Stable and smooth. Only problem is the noise. But it is ok compare its price

I've gotten beautiful photos with this extender. Didn't want to spend the amount but if it works without any defects guess it's worth it. I use this with an Ef adapter with my Canon M50 and using the sigma 150mm - 600mm. Works well enough.

Very Handy and Useful. Clarity is as good as Prime Lenses, but it depends on the Light condition.

preis,qualität sehr gut

It arrived 4 days early - great excitement. But wasn't abler to use it until 2 days after arrival. Tried it with my 70-200 L series zoom on a Canon 7D2. 1. Very easy to fit onto the lens and camera, Felt solid and as if it belonged there. 2. shooting at f5.6 as lost 2 stops (expected) and at various settings. The quality was, to me, entirely acceptable. A ood purchase, to be recommended.

It's a great product. But one thing to know is that it reduces the light by 2 stops hence some older DSLR may not be able to use the autofocus with this extender on.