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.

I have half a dozen lenses for my Canon dslr. Now they are doubled. Works great with my new R5 mark ii body with an adapter as well as my older 5D

I bought the 2X III to go along with my Canon 500 f4 coupled with the Canon 5D Mark III. I use this primarily for bird photography. The 2X works really well with this combination. My 500 mm lens is the 1st series lens but since the glass is so sharp it still works great. If you have good light it will produce very good photos. The sharpness is very good considering there is a 2X extender mounted. The Canon 5D Mark III produces good shots even with high ISO. I don't mind shooting at 3200 or even 6400 if needed and it will clean up very well with editing in Lightroom or Photoshop. One caution, naturally the autofocus is much slower with the 2X attached. You will probably not want to use it for things like birds in flight or quick action shots. Overall, I am happy with the results I get and feel it is worth the price for the combination that I use for birding. I have a 70-200 f2.8 but have not tried it with that combination yet nor do I foresee a situation where I would do so since I have other lenses that would be better on autofocusing. Also, I don't think it would work very well with other lenses that are not Canon L series quality, but I really can't comment on that since this is the only combination I have tried.

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.

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

Despite what anybody says, this is the most cost effective way to double the reach of you telephoto/zoom lens with minimal image degradation. Yes, you lose two F stops but when I use this with my with 70-200 F2.8, it's unbeatable. AND don't be too concerned about image quality - this combo is as good as Canon's 100-400 zoom and better than Canon's 400mm F5.6.

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.

Perfetto, come nuovo, tempo di cosegna super veloci. Peccato che ho dovuto restituirlo. Ho una canon 70D e montando un 70-200mm f/4 mi disabilitava il fuoco automatico(F/4+F/2). State attenti, queste "vecchie" macchine fotografiche hanno il fuoco automatico fino a F/5.6 credo, è un blocco software di canon: le nuove (D80,D90)non dovrebbero aver questo problema ma verificate prima della cquisto. Ho chiesto il rimborso che mi è arrivato dopo almeno 3 settimane.