5D Mark II Team

Improvements & Gear

List of Lenses Affected – Update 3


  • List of Lenses Affected by Iris Issue – UPDATE 3
  • Comments – EOS 7D too?
  • Feedbacks
  • Contact Canon



Due readers requests, we collected all possible feedbacks to make a list of lenses that are affected and not affected by the “IRIS jitter” issue when mounted on a Canon EOS 5D Mark II with firmware 2.0.4.

Please keep in mind this list was made in part with the feedbacks from many readers. We did not test “all” these lenses by ourselves so we cannot guarantee 100% of accuracy, but the “affected” ones are 100% confirmed.


We have detected that there are some zoom lenses with a non constant aperture design, that suffer “iris jitter” issue when zooming in or out.

It is not the change in light when the focal length changes (which is very easy to see on the LCD display). It is REAL “iris jitter” that can be seen and heard, also affecting the LCD image in Live View mode, and of course the video clip if you are recording.

UPDATE: After watching  directly and very carefully the iris behavior during zooming in and out whilst testing zooms with “variable aperture” design, we saw there is no iris issue in those cases.

Question: What happens then, and why do we hear the iris changing while zooming in a non constant aperture zoom in Live View mode?

Answer: The camera “tries” to keep the original aperture value during the zooming process. Since the zoom has a “variable aperture” design, the camera changes the iris a bit (closing or opening it, usually in 1/3 steps) in order to keep the aperture value selected by the user.

We wish there was a function to disable that “aperture adjustment” when zooming in or out a “variable aperture” zoom lens, so the iris would remain in the exact same position, no matter the focal length change. Yes, we know it would result in an increase or decrease of light and exposure, but that is MUCH better than a “jump” of the iris or dropped frames in a footage…

NOTE: We must clarify that the “iris jitter” DOES exist when using the lenses listed below. In those cases there IS an abnormal behavior of the iris, as showed and explained in previous reports.

However, there are also few reports about constant aperture zooms suffering random iris jitter. We can’t still confirm it, but there is a video showing one case (check the comments by readers at bottom)


– Lenses NOT affected by IRIS jitter:

Canon EF 14mm f/2.8L II USM
Canon EF 24mm f/1.4L II  USM
Canon EF 28mm f/1.8 USM
Canon EF 35mm f/1.4L USM
Canon EF 35mm f/2.0
Canon EF 50mm f/1.8 II
Canon EF 50mm f/1.4 USM
Canon EF 85mm f/1.2L II USM
Canon EF 85mm f/1.8 USM
Canon EF 135mm f/2L USM
Canon EF 200mm f/2.8L II USM

Canon EF 16-35mm 2.8L II USM
Canon EF 24-70mm f/2.8L USM
Canon EF 24-105mm f/4.0 L IS USM  (*)
Canon EF 70-200mm f/2.8L IS USM
Canon EF 70-200mm F4L IS USM

(*) UPDATE: According to a feedback (see comment posted by a reader on this topic) this lens may suffer some iris issue, but in a different way. Rather than whilst manually changing focus, the iris wrong behavior may occur randomly.

– Lenses AFFECTED by IRIS jitter:

Canon EF 100mm f/2.8 Macro USM Macro
Canon EF 100mm f/2.8L IS USM Macro
Canon EF 180mm f/3.5L USM Macro

Canon EF 300mm f/2.8L IS USM
Canon EF 300 f/2.8L IS USM + 1.4x TC
Canon EF 300mm f/4L IS USM

Sigma 150mm f/2.8 EX DG APO HSM Macro

Tamron SP 90mm f/2.8 Di Macro AF

COMMENTS – 7D too?

It is more than evident that there is an issue on the iris control in firmware 2.0.4 that affects the communication between camera and lens. It affects most (if not all) Macro lenses and some few non-Macro lenses when rotating the focus ring manually, but also might appear as a random iris wrong behavior in some few lenses.

There are also some users of Canon EOS 7D reporting similar iris issues with the latest firmware update (version 1.2.1). If you have a 7D and experience this issue feel free to post your comment here, as detailed as possible.


Feel free to report any lens that you find to be affected or not affected by the “Iris jitter” problem. We might include it in the list.

Be sure to follow the instructions detailed on this Report to reproduce the “iris jitter” issue. Also check the video posted here to see the iris behavior when directly watching it.

If you find another issue, please detail it as much as possible to discard any wrong camera setting.

Please keep in mind we need to be as precise as possible, so if there is any doubt or inconsistency, double check your lens and camera configuration, and repeat tests if necessary.


Report these issues to Canon. That’s the way to get issues/malfunctions fixed.

Due users requests, we include the information to Contact Canon to report this or any issue you may find:

– USA: 1-800-828-4040 | 1-866-261-9362
– CANADA: 1-800-OK-CANON (1-800-652-2666)
– USA e-mail Support

– UK: 0844 369 0100
– Europe e-mail Support
– Europe  Telephone Support


May 3, 2010 - Posted by | Campaigns, EOS 5D Mk II, EOS 7D, News & Info, Reports | , , , , , , , ,


  1. Nop, my 24-105mm is affected, very badly…
    You can see the problem there : http://blog.alaingrodard.fr/technique/le-dernier-firmware-2-0-4-du-5d-mark-ii-buggue/

    Comment by Alain | May 3, 2010 | Reply

  2. NO:

    Canon 24 1.4L II
    Canon 135 f/2L
    Tamron 28-75 Xr Di II DR XM ZR CF MG 2x XZ DR AP XI RF

    50mm 1.4 and 70-200 f/4 IS

    300 2.8 IS and 100 macro 2.8 USM

    Comment by x | May 4, 2010 | Reply

  3. Have the same iris problem when I use Video mode and zoom in or out with the lens 28-135 EF IS and 10-22 EF-S IS!!!! on my 7D!!!

    I use it in full manual mode! even the lenses.

    Please fix this! I cannot zoom in or out shooting video! something that can be anoying some times!

    best from Chile

    Comment by Ignacio Walker | May 8, 2010 | Reply

  4. Same problem here with Zeiss 50/1.4.

    It’s a pain in the bottocks…so please fix it!

    Comment by Marnix | May 15, 2010 | Reply

  5. I had this happen on a 7D in full manual mode with canon 28-300mm T2.8 IS USM zoom lens.

    If I zoomed all the way in really fast there was a split second delay and then a sudden exposure jump. Very annoying.

    I thought it might have been a rolling shutter glitch, but the exposure compensation would make sense.



    Comment by AMCLeod | July 14, 2010 | Reply

    • Please note that if you refer to the Canon EF 28-300mm f/3.5-5.6 L IS USM lens (we don’t know any 28-300 f/2.8 lens), then we have to keep in mind that it has a “variable aperture” design.

      That means that when you change the focal length (zoom in or out) the camera will try to keep the selected aperture (if you are in Live View mode for movie recording), as we described in the “UPDATE 3” above on this article.

      A very easy and very useful “feature” to add via Firmware would be to be able of disable that functionality, so the camera wouldn’t “try to keep the aperture setting” when you zoom in/out on a variable aperture zoom lens. Very useful for movie/video purpose.

      That whole thing is very different than the real “iris jitter” issue found on Firmware 2.0.3/4 (we posted very detailed reports including explanations on how to duplicate the phenomenon), that was indeed fixed by Canon with Firmware 2.0.7 (and recently Firmware 1.0.8 for the EOS 1D Mark IV and T2i/550D)

      Remember that when using Macro lenses, to avoid any kind of flickering when pulling focus whilst recording movie/video with Firmware 2.0.7 (just as with 1.1.0), the user must set the camera to M mode, and ISO not to “Auto”, but to any fixed value.

      Best regards.

      Comment by Admin | July 14, 2010 | Reply

  6. Hi, I find this problem with the canon 20mm f 2,8, and obviusly qwith the 85mm on my Canon 7D, new firmware?

    Comment by Jose | September 30, 2010 | Reply

    • Hi,

      It’s pretty weird you find this problem with those lenses. It shouldn’t happen.

      Are you sure that:

      – the problem is exactly as described in our previous Reports? (please check the detailed description and video tests)
      – you set the camera to “M” mode and Live View to “Stills+Movie” -> “Movie Display”? (this may be different in 7D’s menu)
      – your 7D is running the latest Firmware 1.2.2 that fixes the “iris jitter” issue?
      Please check this post: Firmware Update 1.2.2

      Also remember that when using Macro lenses, to avoid any kind of flickering when pulling focus whilst recording movie/video with the latest Firmware, the user must set the camera to M mode, and ISO not to “Auto”, but to any fixed value. Although the lenses you mention are not Macro and not supposed to suffer from this iris issue…


      Comment by Admin | September 30, 2010 | Reply

      • I just purchased a Tokina AT-X PRO D 100mm macro for my Canon 5D. I am shooting movie mode and both the camera and the lens are set to manual. My iso is not on auto but i am still experiencing iris jitter when pulling focus.

        Are there any 100mm macros out there that will not have the iris jitters?

        Comment by JShada | November 18, 2010

      • Hi,

        It seems you are setting the camera right (M mode, ISO not to Auto).

        Did you also set Live View mode to “Stills+Movie” -> “Movie Display“?

        If you did all of that, then it’s pretty weird that you still experience “iris jitter”, but not impossible because Macro lenses have a long focus throw/range, on which they change their luminosity. ALTHOUGH when the “iris jitter” happens, the camera does NOT change the iris to another value and keep it, but makes the iris “jitter” instead.

        When using non-constant aperture zoom lenses and the user zoom in or out, the camera “tries” to keep the selected aperture value across the entire focal length range, changing the iris accordingly to the focal length (there should be an option to disable that function, because it makes the footage almost useless due undesired effects like dropped frames, stuttering, etc.)

        Canon EF 100mm 2.8 Macro (L and “non-L” version) don’t suffer this issue any more since Firmware version 2.0.7 (they didn’t suffer from it on Firmware 1.1.0 either, but on that version there was no 24/25p mode, no Manual Audio gain, and the 30p was non-standard at 30.00fps)

        This same issue, that we reported and spread over the net, was fixed on Canon EOS 1D Mark IV, 7D and T2i/550D few months later than the 5D Mark II. So it was very helpful for every other Canon users.

        We sincerely hope your lens doesn’t suffer from it.

        Please let us know if after following all the instructions above, the “iris jitter” is still there. In such case, if you can upload a video showing it, that would be interesting. Unfortunately we honestly wouldn’t expect much attention from Canon about it since it’s a 3rd party lens… 😦

        Best regards,


        Comment by Admin | November 18, 2010

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