As a photographer I can always recommend Canon. This is a great product and it really has only few downfalls to it.1. AF is very slow, so busy scenes are not for this product2. With adapter to use normal EF-S lenses the AF slows down even further3. EF-M lens availability is very limited, which brings you back to the point 2 above.But you get bang for your buck if you can live with the above. Digic 5 processor, touchscreen and the great Canon quality if you shoot more portraits, night scenes and landscapes in general. If you have few canon ef-s lenses you like and need cheap but great EOS experience on the road while not wanting to carry e.g. heavier 6D, 5D bodies... then this is great way to go!

I use this extender with my 70-200/2.8, 300, 400, and 500mm tele lenses for wildlife shooting (hobby). My cameras: 7D, now upgraded to a 7D II, and a 5D III. Important in particular for 2x TC users: both latter cameras still provide an active center field autofocus with lens+TC combos that have an F/8 initial aperture. In particular every birder knows: you can't get enough focal length. And if you don't want to invest in - and carry - a super huge & heavy 800mm lens, you have to have TC's in your backpack. I use Canon's very good 1.4x MK III TC frequently, and less frequently this 2x TC. Many reviewer's here explained already the 2x TC's technical pros and cons in detail. In real life, according to my experience, you can break it down to those three items that really count:(1) images lose visibly sharpness and get softer, in particular in the edges (full frame) but with re-sharpening during post-processing (or sharper pre-settings in your camera) you can get acceptably good results (= you still can see feather/fur textures) IF...(2)... there is enough light available (!!) for a - with many lenses - quite slow combo AND...(3)... the object does not move too fast and unpredictable, because AF will work as sluggish as an old digital compact camera (but accurate with a carefully micro adjusted camera).This may also be important for you:- Oh no, you can't combine Canon's Mark III 1.4x with 2x TC's to shoot man's first footsteps on Moon from Earth. Canon prevented this mechanically, not only by some sort of pins (you could easily remove): the whole TC's do fit because their lens systems extend from their bodies and would collide before their bayonets snap together. Don't complain, be sure that the image quality of such combos would be too lousy anyway for modern high res sensors. If you need extreme focal lengths check if digiscoping (mostly without AF) would be the better solution for you.- Some lenses do not fit with Canon's Mark III TC's because, again, their extended lens systems would literally collide with the back lenses too close to the bayonet. The example in Canon's lens line that I presume is most prone to such a disappointment is the macro lens EF 100mm/2.8 L IS USM. So check the TC's compatibility with the lenses you want to use it with before you hit the order button. Btw you can pimp your macro's magnification by using extension tubes, plenty of good ones with full electronic supply of AF and aperture are available.Final word(s):Given the fact that a 2x TC is always a quite extreme optical compromise, the Canon engineers did a decent job with the Mk III version. But do not expect any wonders. An EF 400/5.6 lens will always be much sharper at 400mm - and focus much quicker - than a 70-200/2.8 II + 2x TC III combo, I can tell from my own experience.Those who just start with the TC business, I'd highly recommend to go first for Canon's 1.4x TC Mk III. It provides less reach but much better optical and AF performance. In practice you can use it much more frequently and get good results.

Perfect with an adapter for my Canon SX40. Thanks!

Automatic AF is very smooth. Pictures seem clearer than the stock 18-135mm that comes with the Canon 70D...you can tell its much newer. For $125 this is the best lens to get i promise

It's an adapter - it allows me to put my EF glass on my EOS-M and they are fully functional when mounted. AF, Metering, aperture control - all good. Made of metal and I appreciate the tripod mount on it - handles my 70-200 f2.8 IS II without a problem although it looks pretty much like a rear lens cap when setup that way :)

I’ve had the canon eos 5d classic as a hobby. It was good for me, but this eos r has a great af and picture quality. I think this eos r camera works as a real upgrade for me, I’m very satisfied with its like-new condition as well.

I bought this to use with my Canon 80d. So far it seems to work perfectly, including the AF assist beam which is an issue with some other versions. This is the 2nd Yongnuo flash I now own. Great quality and so much cheaper than the Canon alternative. I would highly recommend this item.

I just went through the debate between the 40D and XSi. I finally chose the 40D since it is supposed to be built to last, and the recent $200 rebate from Canon placed the cost ($950 body only) on par with the XSi ($800 body only) at the time of this review. Up until now, I have been using an XT and in only 2 years (and about 6000 photos) the auto focus (AF) LEDs began burning out. One is completely gone and the others have dimmed considerable. I have not found anyone else with this problem so it could be that I had a bad XT. Never the less, the XSi has similar dot type AF LEDs and I was worried that an investment in the XSi would lead to another camera with a limited lifetime (I depend on these LEDs a lot).Although I liked the compactness and lightweight of the XT, little did I realize how convenient the 40D is for fast switching of settings. I love this! I won't go into all the positives/negatives of the 40D as it has been beaten to death by now. However, I will mention a few minor pros and cons that are either seldom mentioned, or not mentioned at all.Pros:1. Much better AF LEDs - more visible squares instead of little dots, hopefully longer lasting.2. More multi-controls and generally setup more user friendly.Cons:1. Auto WB is a little off - especially with incandescent lighting and AUTO setting (seemed more accurate on my XT)2. Thin male pins for the remote connector. Male means that there are pins instead of sockets. The sockets are on the switch itself (RS-80N3 or equivalent). This means if the thin pins bend, the camera gets hurt instead of the cheaper switch. I wish Canon had stuck to the 1/8" stereo jack as that solution was much more rugged and allowed the wire to rotate (the wire on the RS-80N3/equivalent point out in the direction of the lens only).Hope this helps!