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Canon Service Notice: 24-105mm f/4L IS II USM Lens | What’s Wrong & How To Check If Your Lens Is Affected

By Kishore Sawh on May 22nd 2017

When we think of just about the most versatile zoom lenses (or lenses period) the standards would be a 24-70mm f2.8, and for Canon users data shows the EF 24–105mm f/4L even more so. Of course, it’s not hard to see why, with that focal length and constant aperture it’s a perfect walk around and travel lens among other things, and for a nice price. In August last year Canon announced the updated version, the EF 24–105mm f/4L IS II USM, and has only been shipping for a short time. In that time, however, a problem has arisen with its auto focus.

Just over two weeks ago Imaging Resource noted that Canon Philippines had issued a service notice about the EF 24–105mm f/4L IS II USM, but that it wasn’t corroborated by any other Canon site it seemed a bit odd, and then it was promptly pulled. However, it turns out tie advisory was real, just premature, and now Canon USA is officially reporting it. Here’s what the problem is as per Canon’s statement:

At the wide-angle end, focus is not achieved properly when a peripheral AF points are selected, regardless of the AF area selection mode.


At the wide-angle end, focus is not achieved properly when a peripheral AF points are selected, regardless of the AF area selection mode.

Affected Lenses

If the first two digits in the serial number (see the image below) of your lens are ”48”, ”49”, ”50” or ”51”, then your lens MAY POSSIBLY be affected.

*Editor’s note: We have a version 2 of this lens in for review right now with a serial number beginning in 51 and it is not affected, so we caution you not to assume from the first digits that your lens is defected. That said, as Canon themselves warn, the list of affected lenses will be updated so check back.

How to check if your lens MAY BE affected

  1. Click HERE to be taken to the serial number input screen.
  2. Input your lens’ serial number (10 digits) and then click the [Submit] button.
    * Please double check the serial number you entered before you click the [Submit] button.
  3. One of the following three messages will be displayed.
    “Your lens is NOT an affected product”
    “Your lens is an affected product”
    “Invalid number”
    *The list of affected lenses will be updated periodically in accordance with the handling status.

[REWIND: Sony A99II vs Nikon D810 vs Canon EOS 5D Mark IV]

Again, our review unit is of an ‘affected’ serial batch but is not affected as per the checker, and through use it seems to be operating normally, but this is probably something you’ll want to verify with your own. As a caution also, the statement suggests it’s just peripheral AF points causing the problem, and depending on the age/model of the camera you’re using your points may be more centrally condensed and you may not be able to judge this performance. As such, certainly use the serial checker.

See full Canon statement page here.

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A photographer and writer based in Miami, he can often be found at dog parks, and airports in London and Toronto. He is also a tremendous fan of flossing and the happiest guy around when the company’s good.

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