Why I buy this one ?
- 1.4x telephoto extender for multiplying focal length of Canon 135mm or longer lenses
- Fits all 135mm or longer fixed focal length lenses and some 70-200mm telephoto lenses
- Preserves autofocus on any EOS camera when combined with f/4 or faster lens
- Weather-resistant construction and improved anti-reflective surfaces in the barrel
- Measures 2.9 inches in diameter and 1.1 inches long; weighs 7.8 ounces

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What our customer's say!

"Better than the 2X", I have the 2x converter but found this to be a bit soft and certainly slow on autofocus with both my 100-400 and 70-200f2.8 lenses. A fellow enthusiast told me to try this converter and I am so glad I took his advice. I used it with my 70-200 at the local airshow and was amazed at some of the shots I got even into the sun [you dont get an option usually at an airshow] The focussing was fast and accurate. Follow the instructions though about attaching this as regards sequence and switch the camera power off whilst adding it otherwise I have found the auto focus doesnt pick up so well if you add it with power on.

"Nice build quality!", I just got this, but was happy to see that it is "L" build. That is, metal and matches the color/style of the 70-200mm f/2.8L IS USM.

No tests yet to comapre before/after. Does anyone know pf a good test pattern to download and print that has progressively smaller lines, like a "bull's eye" style pattern for testing lens sharpness? I see a lot of subjective evaluations, but would liek to see some pictures at a fixed length that actually demostrate the differences.

I'll look for something like this and update this review with pictures once I do.

Oh, and my f/2.8L is a f/4L with this thing attached.

Thanks, Canon!

"Good Toys to play with", There no words to say then GOOD
It very help with the zoom lens.

"Another Good Canon Product", Got this to go with my 70-200L 2.8 IS lens which this is perfect for my shooting needs. Gives the added extension to the lens on my 5D and still maintains the image stabilizing and AF function. Canon did design this to fit only specific Canon lenses.
I tried it on my Sigma 50-500 and the outerbarrel of the TC will not fit inside of the Sigma.
Otherwise the TC was pretty sharp at least my copy is .

"a little heavy for its size but works just great!", It comes with a little bag to store it in the gadget bag and as I said its a little heavy for its little size, yet it doesnt become a burden to carry at all. I am using it with a 70-200 f4L IS and the size of the combined lens looks quite long on a rebel XTi and of course draws attention to it. I dont notice any quaility decrease (on the pictures) when used with this lens, but anyway, im not using any lab equipment or pixel picking to really test that. The build feels solid and it fixes well to the other lens as if it becomes a part of it, I think thats what the intention is of course. The color of this extender is exactly the same as the 70-200 f4L IS which is not white but rather grayish, they both look beautiful together !

I highly recommend it since it does make quite a difference and overall it is a professional and very well developed pice of equipment. Im actually thinking on also having the 2x later on to achieve the 640mm with my 70-200L and a small sensor such as the XTi or the 40D.

Read this reviews before You buy...

"Great Accessory, Great Service from Amazon", I bought this extender to use with my EF70-200L f/2.8 lens on my Rebel XT. I expected the extender to soften my images, but was very pleased to see no softening. And, on my lens, the autofocus still works just perfect.

Amazon did me right yet again with their pricing and delivery, as well. I don't hesitate to recommend Amazon to anyone looking for camera gear.

"Get 1.4 times closer", This is a handy item to have in your camera bag. I use it with my 70-200 f/4L when I need a little more reach and don't want to take my 300 f/4L. Since it's made by Canon it works flawlessly with the EOS system. I've noted no discernible image degradation using the extender.

"Extra reach at minimal cost", I've used the Canon 1.4x tele-extender for about six months with my Rebel XTi and two lenses - a f/4.0 70-200mm (non-IS) and the f/4.0 300mm IS. Most of my shots are of kid soccer and baseball.

For these applications, the 1.4x tele-extender is a great accessory. Because of the extra reach, you can get more frame-filling shots. The loss of image sharpness is minimal and tends to be offset by the fact that you can doing less cropping. Since both lenses are f/4.0, they maintain their autofocus capabilities. If there's any slowdown in focusing speed, it's not obvious.

I took the same equipment on a two week safari in Tanazania. Without the extender I'd have had a much harder time capturing decent wildlife shots. The f/4.0 300mm + 1.4x gave me an effective f/5.6 420mm lens with image stabilization. That was about the minimum for many shots (a leopard with its kill in a tree 120 yards away, for example). Even then, I often wished for more length, but to get it you have to move up to serious telephoto lenses that are much more expensive (and much heavier).

As other reviewers have pointed out, there are many lenses - including Canon lenses - that are not compatible with Canon tele-extenders. Check the list of compatible lenses carefully before you buy. 3rd party teleconverters from Tamron and Kenko are reputedly less finicky, although image quality may not be quite as good.

Many photo equipment reviewers (e.g. Bob Atkins) claim that teleconverters work better with primes than with telephotos. That may account for the complaints about the 1.4x with the Canon 100-400mm telephoto. It works fine with my 70-200mm, but that's generally thought to be a sharper lens than the 100-400mm.

Overall, the 1.4x teleconverter is a relatively inexpensive way to extend the range of your Canon telephoto lenses without significant loss of image quality.

"Decent sharpness, poor Bokeh.", I compared this extender on my Canon EF 70-200 USM F/2.8L IS to the new Canon EF 70-300mm F/4-5.6 USM IS lens. For sharpness wide open, the 70-300mm has the edge, but when stopped down to F8, the 70-200mm w/1.4 has the sharper picture. Granted I was pixel-peeping, but when you have the luxury of comparing for quality alone, not disregarding contrast, resolution etc., you can pixel-peep too (just don't limit yourself by that). In fact, the color of the 70-200mm lens with 1.4x was slightly better even wide open. Now here's where I have my beef, and none of the reviews I've read seem to delve into this aspect: Bokeh. When shooting wide open with the 1.4x extender, I found the quality of objects out of the depth of field to look strange. For example, I was shooting elephants at the zoo (no bullets), and I noticed that the leaves on the trees behind the elephants looked very peculiar--something like compressed green jelly-beans. They were out of the depth of field, but they didn't look natural to me. I mounted the 70-300mm lens and took the same shot, and the leaves were nice and soft, even at f/5.6 compared to the 70-200mm w1.4x extender. So, if you ask me, I don't find the extender useful unless you have no lens to reach the subject as close or closer or you shoot at F8-F11. I certainly wouldn't buy the 2x unless I had no other choice, and weren't going to print anything larger than an 8x10 or go to the web with the pics.

For background, I was determining whether to buy the EF 70-300mm USM F/4-5.6 IS lens over a mere extender for my existing EF 70-200mm USM F/2.8L IS w/1.4x extender. I finally resolved to buying the 300mm F/4 IS Prime Tele instead of either.

"Works well", This product works as advertised. It reduces sharpness a little bit, and costs 1 f-stop, but you get more reach.