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About Canon

This extender has been re-designed optically and offers excellent performance with compatible EF lenses (same as the Extender EF 1.4x II). Features a new seven-element design, and same weather-resistant design and anti-reflection internal construction as the new EF 1.4x II. The EF 2x II doubles the focal length of any lens it's mounted to, and reduces its effective aperture by two stops. With the EF 2x II, AF is possible with any EOS body if the lens has an f/2.8 or faster maximum aperture, and compatible Image Stabilization lenses maintain the IS feature when used with any current EOS camera.

Summary of Customer Reviews

Customers most agreed on the following attributes:
Pros:
Strong construction (37),Easily interchangeable (31),Durable (27),Rugged (23),Fast / accurate auto-focus (21),Lightweight (21),Consistent output (18),Clear glass (7),Easily mounted (5),Easy to clean (4)
Cons:
Slow focus (8),Blurry focus (3)
Best Uses:
Sports/action (22),Wildlife photos (18),Wildlife (17),General purpose (9),Landscape/scenery (7),Travel (6),Landscape photography (4),Photojournalism (4),Back-up (3),Fun (3)
Reviewer Profile:
Enthusiast (14),Photo enthusiast (12),Semi-professional (7),Professional (6),Semi-pro photographer (5)

Canon Specifications

Construction
5 groups /7 elements
Maximum Magnification
2x
Dimensions (Length x Diameter)
2.8" x 2.3" / 71.8 x 57.9mm
Weight
9.3 oz. / 265g

Reviews about this item

Review Snapshot®

 
4.3

(based on 54 reviews)

90%

of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars

     

    (27)

  • 4 Stars

     

    (18)

  • 3 Stars

     

    (7)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (2)

Most Liked Positive Review

 

Excellent for helping 70-200

I used this with my 70-200mm f2.8L IS lens to photograph Eagles and Hawks in the Carson Valley, plus the Reno Air Show. The 2X extender gives me a light weight alternative to a big lens with excellent optical quality. I am very happy with gaining 2X reach for the birds (feathered and jet powered). I used it with Canon 5D and 40D. (Note, the reviewer with limited Depth of Field complaint needs to learn that LESS depth of field is ALWAYS the case with LONGER focal length, not the fault of the 2...

View full Review

I used this with my 70-200mm f2.8L IS lens to photograph Eagles and Hawks in the Carson Valley, plus the Reno Air Show. The 2X extender gives me a light weight alternative to a big lens with excellent optical quality. I am very happy with gaining 2X reach for the birds (feathered and jet powered). I used it with Canon 5D and 40D. (Note, the reviewer with limited Depth of Field complaint needs to learn that LESS depth of field is ALWAYS the case with LONGER focal length, not the fault of the 2X.) A friend shooting indoors had trouble with the 2 stops loss, it is harder to focus in a low light condition. But outdoors I have no troubles. I find the auto-focus and image stabilization work fine on the IS 70-200 f2.8 'L' lens. Auto-Focus (with AI-servo) follows the big birds in flight also.

VS

Most Liked Negative Review

 

Not fitted for all lenses

Only fits a few lenses. No where in the literature did this extender say it only fits a couple of lenses in the Canon arsenal. Bad marketing on Canon's part. Check carefully with Canon's web site prior to purchase to make sure you have a lens that will fit it. So this product is unrated as I was not able to use it.

Reviewed by 54 customers

 
3.0

Canon Extender x2

By

from Glendale, CA  -  Pro Photographer

Doubles the magnification at the cost of two F stops. Must have a fast lens for autofocus to work.

 
5.0

A bargain!

By

from Mist, OR  -  Photo Enthusiast

It takes a bit longer to move from my 24-105 to my 70-200+the 2x extender than it might to go to a 100-300 BUT I get more flexibility (70-400) this way. Auto-focus has not been significantly impacted and the ability to manually focus hasn't changed at all. Try as I might, I can think of no negatives. My 5 star rating is made on the assumption that the 2x extender performs as well on other lenses as it does on my 70-200 (non IS). The buying experience from Adorama was as usual terrific, my only complaint being that I'm forced to take a day off work to be here and sign for the box. There should be an option at checkout to forgo the security of a signature.

 
3.0

returned, not compatible

By

from scottsdal, az  -  Photo Enthusiast

cannot use

 
5.0

Does a great job ... not for me though

By

from Jarrell, TX  -  Pro Photographer

I thought I would use this more than I did. It works perfectly, so no complaints there. Just remember that it will double your aperture. Attached to my 70-200 f/2.8 on my 5D ... it became a f/5.6 but did a FANTASTIC job gettin pic's of a full moon. For stills or someplace that lens 'speed' is not an issue, it's a great way to get a 140-400 out of a 70-200. For fast action ... I'd pass.

 
5.0

Excellent Product

By

from Amarillo, TX  -  Photo Enthusiast

I shoot mostly wildlife and birds. I keep the 2.0X and 70-200F2.8L lens mounted on my Canon 50D so it is ready for a target of opportunity in the backyard. One of my wildlife photographer friends uses a 500MM zoom and is continually surprised at the sharpness and detail I get with distant subjects. This combination of camera, lens and extender has exceeded my expectations. The only downside is slow autofocus for birds in flight. I do 99.9% of my work handheld (propped against a tree, fence, wall, etc when possible). Yes, I will purchase a 500MM or 600MM when the budget permits.

 
5.0

Awesome Product!

By

from Fargo, ND  -  Photo Enthusiast

Many reviews have stated that the 2x extender degrades image quality, but with my prime Canon 400mm 5.6f USM lens, one can hardly see any degradation at all. However, the prime lens is super sharp and clear to begin with, which probably makes the difference. It really pulls things in close at the fraction of the cost of buying a bigger lens. You do lose autofocus when using bigger lenses with the extender though. I had also read that one should expect a dark viewfinder when using a 400mm lens and a 2x extender, but I have had no problem with that. I would however recommend using a monopod or a tripod. I used to be able to hand-hold the 400mm lens, but adding the 2x extender makes it a little tricky to do so. Overall, I would definately recommend this product, especially for those who are on a budget.

(1 of 1 customers found this review helpful)

 
5.0

Much better than I expected.

By

from Chicago  -  Semi-pro Photographer

I got this 2X extender for use with my Canon 70-200/f2.8 zoom lens (on a Canon 5D body) and tested it with the zoom at the 200mm setting. I photographed a Photo Lab Index resolution test chart, with the chart filling the viewfinder at the 200 and 400mm focal lengths. After eliminating the image shake at 400mm by using a tripod and high shutter speeds, I found that the resolution was about 70 lines per millimeter, both with and without the extender on the zoom lens. The resolution was tested one stop down from wide open and was constant across the image from corner to corner. I found only the slightest reduction in contrast with the extender attached to the lens. This result was much better than I was expecting. Some other brands of extender that I've tested have been so incredibly bad that I never bothered to use them.

(1 of 1 customers found this review helpful)

 
5.0

Works much better than I expected.

By

from Chicago  -  Semi-pro Photographer

I got the 2X extender for use with my Canon 70-200/f2.8 zoom lens and tested it with the zoom at the 200mm setting. I photographed a Photo Lab Index resolution test chart, with the chart filling the viewfinder at the 200 and 400mm focal lengths. After eliminating the increased image movement at 400mm by using a tripod and high shutter speeds, I found that the resolution was about 70 lines per millimeter, both with and without the extender on the zoom lens. The resolution was tested one stop down from wide open and was constant from corner to corner. I found only the slightest reduction in contrast with the extender attached. This result was much better that I was expecting. Some other brands have tested os bad that I never bothered to use them.

 
3.0

Great addition!

By

from BC  -  Photo Enthusiast

I use this with my 70-200 F2.8 is L series lens. 7d Canon camera. I was debating back and forth between the 1.4 vs 2. In the end I went for the 2 as I felt I needed distance most. Aside from the 2f stops I notice a slower focus especially when adding it to the 2.8 lens. It's also adds weight especially to the IS L series lens. For the price it's a nice add on as well as the ease of carrying. I've not tried the 1.4 maybe in the future for another option.

(1 of 1 customers found this review helpful)

 
4.0

Excellent Product

By

from Amarillo, TX  -  Photo Enthusiast

I mount this on my Canon 50D and 70-200 f2.8L lens. The EF 2X Extender was my low cost alternative to a longer lens. I shoot all my wildlife and birds handheld, bracing against a tree, fence, wall, etc when possible. One of my camera buddies who shoots with a 500mm is impressed with the results I get. I do plan on eventually purchasing a longer lens. My only complaint is the slow and searching autofocus, especially for birds in flight. I frequently have to manually focus, which is why I gave it a 4 star rating instead of 5 star. Photograph quality is excellent through the entire range. I donate many photographs to charity fundraisers and they have been very popular and sold well.

Q&A

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Questions about this item:

Shopper  Why Did You Choose This?
TARA G  reviews and price point
Shopper  Does this extender fit a 58mm lens?
JAMES O  nope
Ed G  Will this work with the 18-200mm lens too? Tks, Ed
ALAN S  Sorry I don't have experience with the Canon 18-200 lens. From the picture you can see the protruding lense. I had negative clearance on my TAMRON 55-300. Great addition on my Canon 100-400 L lense but you do lose auto-focus.
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