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Canon EF 1.4x II extender 35mm Converters

4.83 star rating
                      4.83 / 5 (6 Reviews)
MSRP : $309.00


  • Magnification1.4x
    FocusAutofocus, Manual Focus
    Optical Construction4 Groups / 5 Elements
    Diameter2.9 in.
    Length1.1 in.
    Weight7.8 oz.
    MPN6845a004
    Product ID21850288

Product Description

The new EF 1.4x II extender replaces the previous (and highly regarded) EF 1.4x extender. New on the EF 1.4x II is added weather-resistance to the front and rear mount surfaces to match the level provided by the EOS-1v and the new IS super-telephoto lenses. New internal anti-reflection construction improves contrast even when shooting in heavy backlit conditions.


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Reviews 1 - 5 (6 Reviews Total) | Next 15

User Reviews

Overall Rating:4
Value Rating:4
Submitted by Photoelectric a Intermediate

Date Reviewed: September 16, 2009

Strengths:    Lends flexibility to existing compatible lenses. Lighter than getting a dedicated long telephoto lens, great image quality.

Weaknesses:    Image quality degrades when lens is not at full telephoto - no zooming. Pricey!

Bottom Line:   
Used on my 70-200 f4 IS and Canon 40D, this converter has given very good results. The trick is to use it with the 70-200 zoomed all the way out to 200. Used this way, the images are very sharp.

Expand full review >>

Duration Product Used:   6-10 years

Price Paid:    $400.00

Purchased At:   Lens and shutter

Type of photography:   Outdoor


Overall Rating:5
Value Rating:4
Submitted by jackthehat.co.uk a Expert

Date Reviewed: May 10, 2007

Strengths:    Build quality
Optical quality
Water and dust resistance
Excellent resale value
Stackable with 2x extender
The best extender money can buy but not a substitute for a longer lens.


Weaknesses:    Even though it is top quality I still feel the price is just a tad steep


Bottom Line:   
I already have the 2x extender and bought this one on impulse after hearing good things about it. I thought I would keep this and sell the 2x extender but now I am not so sure. Most people are under the impression that the 1.4x extender is far superior to the 2x. Technically that's probably true but only because it's logical. The greater the magnification, the greater the quality loss so the obviously the 1.4x should give better results. Surprisingly I don't find that to be true. The results certainly aren't noticeably superior to the 2x initially. The only lens I own that is compatible with these extenders is the 70-200 f2.8L IS so my test results are based purely on that.

If you shoot wide open with either of these extenders then the quality can be disappointing, especially on the APS-C sensor SLRs (350D, 400D, 30D etc). But stopping down just one stop makes a massive difference in quality.

Let me put it simply... these extenders DO NOT substitute a good lens i.e. a 200mm lens with a 2x extender will not get the same quality as a 400mm lens but the quality is still good, especially when stopped down.

If, like me, you have an APS-C sensor SLR (i.e. not the EOS 5D or EOS 1Ds etc) then remember that even without an extender, your camera is only using about 50% of an L series lens' optics. The outer part of ALL the L series optics are wasted on the smaller sensored cameras. That isn't normally a problem as you avoid things like vignetting etc but remember that when you add an extender (especially the 2x) then your camera will only end up using something between 15% and 25% of the total optical surface. That is a HUGE task to ask of any lens, even an L series lens! So, quality is bound to suffer, it's only logical!

If your lens is f4 or faster then AF will still work well with the 1.4x attached. Surprisingly the AF doesn't really suffer and is not really much slower with the extender in place. Likewise, if you have an f2.8 lens, AF still works great with the 2x attached. Image Stabilisation is not affected regardless and works fine.

I also tried 'stacking' the two extenders together with my 70-200 lens. That gave me an effective 900mm lens in 35mm terms on my Canon 350D. Surprisingly the quality was actually quite good. I expected it to be rubbish but it really is impressive. Naturally AF won't work so manual focus is necessary but the IS still worked fine. Those of you still shooting film with an EOS 3 or an EOS 1 will still be able to use AF even when these extenders are stacked (Wow!!!) Interestingly the 1.4x extender MUST go next to the camera body when 'stacking' simply because of the way it is made. It is impossible to use them any other way. You cannot stack two 1.4x extenders together, only two 2x extenders or a 1.4x and a 2x.

Both extenders are now water and dust resistant which is good. Build quality is absolutely 100% perfect. Just remember that these extenders only work with selected L series lenses, make sure you check before buying. I have just got the 24-105mm f4L IS and it does NOT work with the extenders (not that I care).


To summarise, the 1.4x extender is as good as money can buy and the results are certainly very good. Just don't make the mistake of thinking it is a substitute for an additional lens. The price may seem steep for what you get but all that money is invested in top quality optics.

Expand full review >>

Duration Product Used:   11-20 years

Price Paid:    $209.00

Purchased At:   www.jackthehat.co.uk

Similar Products Used:   Canon 2x Extender II
Teleplus teleconverter (Absolute JUNK and a complete waste of money... don't even think about it!)


Type of photography:   Other


Overall Rating:5
Value Rating:5
Submitted by JKP a Expert

Date Reviewed: June 29, 2005

Strengths:    very minimal loss of image quality, light & compact

Weaknesses:    not inexpensive

Bottom Line:   
Purchased with to go with 70-200 f2.8 (on my 10D) to shoot wildlife. Gives me excellent 'reach' in a relatively light, compact package and minimal loss of quality from an excellent lens. A monopod, at a minimum, is required for sharp images in most situations due to weight and magnification

Expand full review >>

Duration Product Used:   21+ years

Price Paid:    $280.00

Purchased At:   B&H

Similar Products Used:   Canon EF 70-200 f2.8

Type of photography:   Outdoor


Overall Rating:5
Value Rating:5
Submitted by Marshall5 a Intermediate

Date Reviewed: April 22, 2004

Strengths:    Size. Sharpness

Weaknesses:    None

Bottom Line:   
This converter worked extremely well with my 200 mm 2.8 and 70-200 2.8. Pictures were very sharp and I am extremely pleased with the converter.

Expand full review >>

Duration Product Used:   21+ years

Price Paid:    $270.00

Purchased At:   B& H

Similar Products Used:   200 2.8; 135 2.0; 100 2.0; 70-200 2.8; 28-70 2.8

Type of photography:   Outdoor


Overall Rating:5
Value Rating:5
Submitted by Lionheart a Expert

Date Reviewed: February 9, 2003

Strengths:    AF speed of attached L lenses is essentially unaffected. Razor sharp photos.

Weaknesses:    none

Bottom Line:   
Optical quality is up to par with its previous counterpart. AF speed is undiminished-much better than the previous version.

Expand full review >>

Duration Product Used:   11-20 years

Purchased At:   B & H

Similar Products Used:   previous 1.4x L converter.

Type of photography:   Outdoor



Reviews 1 - 5 (6 Reviews Total) | Next 15

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Canon Extender EF 1.4X II Teleconverter and autofocus

Can I get some straight scoop on autofocus as it relates to Canon's 1.4X II TC? I have a 20D, and I'd like to get the TC for use with my Canon 70-200 f/2.8. Will I have autofocus at all f-stops, even as wide as f/2.8? I've read that one has to stop down to f/5.6 with the TC in order to make autof ... Read More »

Read More »



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