Question about Canon Extender EF 2x II Lens Converter

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Lens compatability I have purchased the above Canon 2x extender and wanted it to fit a Canon image stabiliser 75-300 lens about three years old and a 18-200 with optical stabiliser which is brand new. I cannot work out how either fit together despite having owned extenders in the past and not having any difficulies. I look forward to hearing from you, Thanks, John

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Apparently, the extender is designed to work only with specific lenses. B&H Camera has a chart available here showing which lenses it is compatible with. Note that even if the extender will fit on a specific lens, autofocus capability is not always possible. All the lenses listed are professional series ("L") lenses, and I don't see any 75-300 or 18-200 listed.

Posted on Jan 26, 2009

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Hi- purchased the Extender EF 2X II; it seems fine with my fixed focus 300mm, but the auto-focus doesn't operate with my 70-200mm EF IS USM zoom, in any mode. Any suggestions? Thanks G


You haven't stated which body you have but the AF will not work with the extender if the effective lens aperture is too low (remember that a 2x extender doubles the focal length but halves the effective aperture).

Canon's own website states: "Autofocusing does not operate if the effective maximum aperture is greater than f/5.6 (greater than f/8 on the EOS 1V and EOS 3)."

Aug 01, 2010 | Canon Extender EF 2x II Lens Converter

1 Answer

Canon Extender EF 2x II


There are 2 Canon fittings, EF for all EOS cameras and EF-S for 'crop' cameras. The Canon extender does not fit crop cameras. Whichever make you look at, make sure it will fit the type of mount you have.
If you have not yet bought your lens of choice, Sigma are good and do their own extender compatible with their own lenses but not Canon's. This may be a good option for you

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What lens actually fit my ef lens dont


I think you will find your answer here: Canon USA.

It is a link directly to the section on your converter

Dec 26, 2009 | Canon Extender EF 2x II Lens Converter

1 Answer

The lens cover does not open or close completely. just started happening. the camera is 2 years old and the battery is fully charged


A stuck lens cover is a fairly common problem, but it is normally easy to fix. A single grain of sand jamming the cover mechanism is normally the culprit, and you want to try to dislodge it: 1) Try blowing lots of compressed air around the lens cover to clean the mechanism. Or use a hair dryer for a few seconds (don't want to heat up the camera). Use no heat mode if possible. 2) Slide a thin strip of paper between the lens cover shutters and the outer support ring. Work it around 360 degres to clear out any debris that may be in there. 3) With the lens barrel extended and pointed downward, tap the lens barrel with a pencil while you extend and retract the lens by powering the camera on and off. Repeat the above three steps several times. If repeated tries don't work (keeping in mind that it usually does), it then may be necessary to open the lens barrel to access the lens cover mechanism.

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It's the same 3 as with the 1.4x, but be warned it is likely to be a very unsatisfactory solution in all but the very brightest daylight, and the lens will continually hunt for autofocus - you risk burning out your focussing motor.

If you really want to experiment, hold the converter so the writing on it is the correct way up. Looking at the row of gold pins, rotate the lens so they are at the top, or the 12 o'clock position. It is the 3 leftmost pins you want to cover. Use a piece of sellotape (scotch tape) to cover the three pins, you'll have to cut a thin strip to do it. Be careful as the tape could slip as you attach the converter to the lens adding more risk to the experiment if it gets stuck somewhere it shouldn't!

I tried this with my 2x (version 1) and a 70-200f4/L, it tries to focus but fails with the much reduced light. Might try it outside on a sunny day, but also scared of damaging my lens!

Jan 28, 2009 | Canon Extender EF 2x II Lens Converter

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