UPDATE 12/01/09
Complaints keep trickling in and sadly there’s been no resolution. Not everyone is having the problem, but it’s far too many. Canon has not responded further (shame on you Canon). For now all I can suggest to those having the issue is to contact Canon and voice your thoughts. Also keeping leaving comments and letting people know about the issue. When shooting I’m just staying aware of the problem and watching for the lens coming loose, hoping to avoid further accidents.
UPDATE 09/09/09
I sent my MK2 body and broken 24-70L lens to Canon. They returned my body stating everything was up to spec and sent a repair quote for the lens which broke when it fell off at my last wedding. My rep got them to repair the lens at no charge. I’m thankful he worked with me, but forced to wounder. Would he have been allowed to help had I been non media related? I don’t know.
The bigger concern I have is that Canon did not acknowledge the problem. What happens the next time a lens falls off in the middle of a shoot. They come loose frequently and usually I catch it before disaster strikes, but not always. Will Canon keep fixing lenses for no charge? I have my doubts .
I use a battery grip, so perhaps my hand is held slightly different? I’m curios if others having the issue are using the grip. I’ve talked to my rep about possible causes and we’ve come up with no answers. The bottom line it that a locked lens can be detached (presumably from a button touch while zooming) and if not caught in time (easy during the heat of an event such as a wedding) it falls off.
This keeps happening, but not to everyone. We’ll see where it goes and I have hopes that Canon will find a solution for those of us dealing with it. Please keep reporting your findings. If you break a lens because of this Contact your Canon rep, see if they’ll take care of it and let us all know how it goes. If I get further info I’ll let you know.
UPDATE 08/26/09
The release button position falls directly into the thumb path for many of us while zooming (especially on short lenses). Larger lenses are not entirely immune, but seem to have less issues. Perhaps due to more wight (more force to turn loose) and perhaps that the control hand would be further up on the barrel with a large lens and close to the release button on smaller lenses.
More reports keep coming in and I had yet another lens disaster. Last weekend at a wedding I had multiple lenses come loose including my 17-40 and 24-70, but I was wary and realized it, until at one point during heavy shooting the 24-70 came loose and fell about 6ft to a ceramic floor with a sickening smack. It no longer works properly.
My Canon rep sent me loaner MK2 and 24-70. I’ve not shot with it yet, but from my tests, the lens seems to release every bit as easily as my body I just sent to Canon service, along with my damaged lens. The button is so sensitive that a slight touch will unlatch it. If you don’t realize it, it’s a simple matter to it to turn entirely loose and fall off. Especially since lens mount seems looser than previous models like my 30D. Further experimentation on my 30D shows me that the lens can still come off, but the difference must be enough that it has never been a problem for me or others.
I fear that Canon will say there’s nothing wrong. I can’t tolerate this and neither should anyone having the problem. Could it be I’ll have to turn to Nikon after using Canon my entire career? I have not heard one such report on Nikon bodies. We’ll see how Canon responds. They have a good track record and hopefully with rise to this and find a solution. I’ll keep you all posted.
UPDATE 06/29/09
The lens keeps unlatching, but I’m watching for it and have not had any more falls. With me it happens on the 24-70 L. Other reports keep coming in however. I compared it with my 30D, and it just seems like the release button it hypersensitive, making it easy to turn the lens off while zooming. I spoke with Mike, my Canon rep and he’s going to arrange a loner body so I can send this one in and have them look at whats happening. I’ll report back.
UPDATE 05/31/09
Doing further experimentation. The lens worked loose twice at Saturdays wedding but did not fall off as I was watching for it. It seems (especially on the 24-70 2.8 Canon) that it’s VERY easy to Inadvertently hit the release button while zooming. It’s very sensitive and and takes only a slight touch to release the lens allowing it to turn while you zoom. Perhaps the button is more touchy on the MK2 vs other Canon bodies? Or even just certain units in the MK2 model? Will update again soon.
Original Article. 05/18/09
by Gavin Seim: Please share this so we can use the net to get feedback or tips on it. I’ve sent the tweet below on my twitter and requested RT’s. You can paste it and do the same if you like. This is a simple way to hear from the world on their experience with this…
RT @gavinseim + others had lens fall off 5D MK2. Anyone else on MK2 or others? RT & lets find out… http://bit.ly/SpG31
Those who listen to the PPS podcast are aware that I recently sent my brand new 24-70 2.8 L lens to Canon for repair because it fell off my 5D MK2. I love my MK2, but I was on the dance floor at a wedding happily shooting away and next thing I know my twelve hundred dollar lens is rolling on the floor. Pretty disconcerting.
There’s was that chilling intake of breath from the crowd, that most of us who have publicly dropped a piece of gear are all to familiar with. Like any pro, I kicked the lens off the dance floor with disdain, while casually saying. “Heck that old thing. I have a whole case of them in the car”. OK seriously though, I kept cool and finished the wedding just fine. If you want to hear about that listen to PPS podcast #58.
Naturally Canon treated the situation as if I’d dropped the lens outright and the the repair cost me about $200. Not a huge deal. I figured perhaps I somehow hit the release button. Then I got to thinking. Should that happen since you we you have to to rotate a lens with some pressure to take it off. Probably most people thought I was being clumsy and did something wrong. I was using the camera quite normally however.
I was about to let it go when I found I’m not the only one this is happening to. Seems that there’s various reports coming in about lenses falling off the MK2. More all the time. So I decided to write this post to talk about this. Does this happen commonly? How about on other cameras besides the MK2. Do Nikon’s ever have this issue?
This is not some conspiracy theory about Canon having a plot to make all our lenses fall off and break, so we’ll buy new ones. (then again… Just kidding) I just want to know. Have you had this problem? I’m concerned that the locking mechanism does NOT always stay locked. These are VERY expensive lenses we photograph with. The risk of dropping while changing on the go is bad enough. We don’t one more thing to worry about.
Thoughts?
, or 
The Lens Pen
