is there a bug in latest Canon EOS 5D Mark II firmware 2.0.4?

by planetmitch6 Comments

I've seen several reports on twitter and now the 5D Mark II Team has detailed a bug in the latest Canon EOS 5D Mark II firmware version.

UPDATE: read this blurb from the canonrumors posts (I don't know much about lens inner workings so I can't comment):

Redrock Micro

From the 5D Mark II Team site:

Description of the problem:

When a Canon EF 100mm f/2.8 Macro USM lens is mounted on the camera and the user manually changes focus (rotates focus ring), the lens changes the iris/aperture “by itself”, even when the camera is in full manual mode.

It is not normal, and should not happen. The tests were made by several users with many copies on many camera bodies, so it’s not an isolated lens problem.

â–ª This malfunction always occurs in this situation:

When the camera is set to M (Manual) mode and in Live View mode (Still+Movie – Movie Display), which is the correct mode for “full manual control” in movie mode.”

Please read more of the details at the 5D Mark II Team page for this issue.

There is also good discussion over at canonrumors.

(Photo credit: snap from the video)



  1. Thanks for your post.

    We take this very seriously and put big efforts, as every post regarding a possible issue/malfunction or anything related to Canon gear. Because we like Canon products and we use Canon for professional purposes.

    We do not want to post anything inaccurate or wrong, at all. We made lot of tests before making the report public.

    It was also reported to Canon last week by several Professionals of video and filmmaking who are in contact with us.

    This is a group effort, not only “one person” like many people may think.

    Thanks a lot once again.

  2. Thanks for your hard work but I am having a hard time understanding the problem. I presume the issue is that exposure will shift with focus pulling when movie recording in manual mode.
    I have a 5D2 with 2.0.4 & 100/2.8 Macro Ultrasonic and all I see when pulling focus from about .39 to near infinity mark is lens breathing but no shift in exposure.
    What exactly am I supposed to see that illustrates this problem?

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  5. Tested a lot today & saw the issue w/ 5D2, 2.0.4 & 100/2.8 Macro USM (not L) in manual mode BUT only when in Auto ISO. There is a definite flickering of the exposure when pulling focus. So this is obviously also an unpredictable issue which makes it even more troublesome. Tested also w/ 17-40, 50/1.4, & 70-200/2.8 L (non IS).
    Can someone please recommend any Canon 24 or 28 range, 50, and moderate telephoto that do not breathe too much if at all?
    Or must I switch brands?
    This is a genius site. Thanks for making it available to dummies like me (hmmm & maybe only me LOL)

  6. Hello there Planet 5d,
    I have come across another problem on my 5d mark 2 and I will have to send it back to Canon for them to take a look at it. It went in for repairs because the usb socket broke off from the main circuit board and they replaced it with another. THEY ALSO UPDATED IT´S FIRMWARE to 2.0.4. I got the cam about 3 days ago and yesterday I did a job with it and noticed that the images were slightly different. I checked all the setting and they match exactly as before I sent it to Canon. So I got an older raw image and compared it to the one I did yesterday. Instead of defined pixels I got defined micro lines that build the image. I have the test ready here to show u. If u could give me an email I will send it to ya. I don´t think it´s hardware, I think it´s the firmware. I have not changed it back to the original one as I don´t want to mess up the garantee. Have u ever heard of anything like this before ?? Please help me out guys. Best regards John

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