Canon EF 1.4X III Telephoto Extender for Canon Super Telephoto Lenses

As an amateur photographer who lives in Alaska and loves to shoot wildlife I was wanting this badly and finally grabbed it right before I went on a bear viewing trip. Design: As with everything with Canon, these are really well designed and work perfectly. They even updated the color on these to help them match better with the newer version of the 70-200 and the 100-400, so that is a nice bonus. It is light but still has some good weight to it so you can feel the quality construction. As for the use of this, it works perfectly with the EF lens series. I can also verify that it works with the RF-EF adapter on the mirrorless cameras. REMEMBER THAT THIS WILL MOVE EVERYTHING UP ONE STOP ON THE CAMERA and EFFECTS THE AUTOFOCUS POINTS. MICRO-ADJUST THE CAMERA TO ENSURE BEST FOCUS or, like me, your photos will just seem to be slightly soft on focus Cost: I purchased it for $340, currently $429 Overall: I am a Canon equipment user and this is just another in a long line of great products Positives: ++Cost (but I got it almost 25% off) ++Design Negatives: --Autofocus effects --F-Stop adjustment Would I recommend: Absolutely/Borderline. Absolutely I would buy it again, borderline if you are not sure what to do with the other settings on your camera. Photos attached with the adapter on

Quick and easy to use in the field. I use a crop sensor camera. This extender is just enough & helps me not have to shell out huge bucks for a 800mm lens, and does the trick. Must stop down 1-2, and photo is a tad grainier; however, I need to micro-adjust my camera first before totally blaming the softness of my shots on this extender. Works well, and glad I have it. Easier than carrying around my Tamron 600mm weight wise, although it does add a bit of forward weight. For the $, I'd say it's a good choice for me. I have the 2x extender, but find this extender's pic quality is better, and less cumbersome to shoot with.

With the Canon EF 1.4X III you can extend your lens focal length and still have fantastic picture quality for much less than buying a new lens. NOTE: The auto focus compatibility is a little confusing. Canon states that auto focus will work if your lens max lens aperture is 5.6 or faster. I also verified that Canon states that this extender is compatible with the Canon EF 100-400 f/4.5-5.6 lens. So, I assumed that the auto focus would work with my Canon EF 100-400 L IS lens since it is a f/4.5-5.6. But, the compatible aperture opening is figure for "after" your EF 1.4X III has been attached to your lens. Thus, the decreased aperture opening put the lens out of auto focus ability. I thought this was very misleading. The auto focus works well with this on my EF 70-200 f/2.8 lens, but I already have a EF 2X II that works fine with that. I highly recommend this Canon EF 1.4X III Extender, but be aware of autofocus compatibility.

I considered giving the Canon EF 1.4X III Telephoto Extender five stars, and when all is said and done, it may/probably does deserve it. The first time I used the extender (with my Canon 70-200mm telephoto zoon lens), it was to photograph birds, including hummingbirds, at/near my feeders. In that instance, some of the resulting photos turned out slightly fuzzy, and my first thought--and the reason for four-star instead of five-star rating--was that it wasn't as good as advertised. However, I now believe that the reason for the fuzziness was that I was a little too close to what I was photographing; that I'm not completely sure is the reason I gave the lens four stars instead of five. Since that first experience, I have used the 1.4x extender to take more bird photos as well as photos at youth baseball games. In those instances, the photos turned out beautifully. I'm an amateur, but I felt/feel the auto-focus is fast, and the photos appear clear. I have a pretty good camera and zoom lens, which definitely help, but a poor extender would negate those attributes. Instead, the Canon EF 1.4X III extender, working with my camera and lens, produced sharp photos, even when I used the continuous shooting mode and even after I cropped photos because the main subject was fairly distant. All in all, to this point...I have been using the extender for about a month...I am very happy with the results.

Exactly as described. Put on my 100-400 lens and adds the perfect reach without loosening picture qualit

This product is fantastic when it works. It doesn’t fit non-L Canon telephoto rear EF mounts. Works best with L series telephoto primes. Advised to check the list of compatible lenses before buying. When used with Canon crop sensors like 80d one gets 2.2x zoom with 24 mp resolution. That’s great at 300 mm focal length for birds or wildlife. Buy it if you can put it to good use.

Use it with my Canon EF 100-400mm f/4.5-5.6L is II USM. It is the sharpest zoom on the market, and the loss with this converter is minimal. Yes you do lose one stop of light, but the IS of that lens is so good that it does not cause issues.

extender is mandatory in wild life photography

Most people I have talked to advised me against using any TeleConvertor or Extender, as it seems it reduces image quality significantly. However, I wanted to test it out myself (as I was looking for additional reach for my EF 100-400 F/4.5-5.6 L IS II Lens). The 100-400 is an incredibly sharp lens with f/5.6 @ 400 mm. Using this Extender drops the F-stop to f/8. When I used the combo on the field, I was actually blown away by the image quality produced. Sure, there is a slight drop in image quality (as expected), the F-stop reduces by 1 stop (from f/5.6 to f/8), and Auto-Focus becomes a bit slower, but the reach is expanded (400 mm to 560 mm). Additionally, when compared side by side, an image @ 400 mm cropped to half (remember with 1.4x extender, the image gets 2 times bigger) against an image @ 560 mm did not show any difference in quality. Both images were crisp and sharp, with all details visible. Attached are 2 images for comparison. The swimming bird was shot without the Extender @ 400 mm while the standing bird was shot with the Extender @ 560 mm (both using the same body and lens). If you are into bird photography, and you already own a crisp and sharp lens, this Extender would be a nice addition to your kit - definitely a must-buy. But before you buy, check if your camera body can auto-focus at f/8 (most recent bodies can), else you will loose the AF capability.