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


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

1 Answer

Canon Extender EF 2x II


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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

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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!

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