andreimoment Posted May 10, 2007 Share Posted May 10, 2007 This is the ring where the lens hood attaches and where the text "CANON ZOOM LENS EF 24-70mm ..." is engraved. <p> Today I took the camera out of the bag and noticed that the ring was loose. I suspect that the lens hood which was attached to it exercised extra pressure and eventually broke the glue which was holding it in place. <p> Take a look at the photos showing the ring in place and when it is loose. <p> <img src="http://img170.imageshack.us/img170/5425/2470lringdisplacementcouu8.jpg"> <p> There are 3 spots with glue residue on the lens barrel under the ring. The glue is still sticky, and there is no sign of anything being broken. The ring stays in place but if I attach the hood to it, the ring slowly slides out (sometimes I hold the camera with the lens down so gravity pulls on the ring). <p> I wonder if it's possible to fix it myself as I can't afford to send it to canon ($150+2weeks or longer during my busiest time). <p> Any suggestions? Link to comment Share on other sites More sharing options...
mars c Posted May 10, 2007 Share Posted May 10, 2007 Is it a brand new lens when you got it? Link to comment Share on other sites More sharing options...
serguei_fenev Posted May 10, 2007 Share Posted May 10, 2007 Hi Andre, It is not glue but three tiny pins that hold the ring. I had the same problem with my lens. I was also confused with those glue residue (I had less than on yours lens)and after searching on internet to find out how to fix it I reailized that pins fall down and didn't hold the ring anymore (not a good design for a such expensive lens). I sent mine to the Canon service centre and they fixed it for free. It took less than a week for a "return trip" here in Canada (Toronto). Good luck. Link to comment Share on other sites More sharing options...
andreimoment Posted May 10, 2007 Author Share Posted May 10, 2007 mars: No, I bought it used 2 years ago. Serguei: Thank you. How did you describe the issue with canon -- what terms should I use to convey the issue with them clearly over the phone? Thank you. Link to comment Share on other sites More sharing options...
serguei_fenev Posted May 10, 2007 Share Posted May 10, 2007 Andre, I've sent you an e-mail with details. Indeed I sent them an e-mail with details almost identical to the discription you posted here. Link to comment Share on other sites More sharing options...
robin_sibson1 Posted May 10, 2007 Share Posted May 10, 2007 Nasty. Pins or very small screws? Either way, it looks as if they have been subjected to stresses FAR beyond what they are designed to handle, and have responded by tearing holes in the lens barrel component through which they project. I would imagine that repair would require the replacement of that component, the pins or screws themselves, and the bayonet ring on which the hood mounts, and that's going to cost a bit, although if the lens is otherwise sound then it's certainly an economic proposition. It's probably a good idea to reduce the risk of this in future by reversing the hood when the lens is not actually in use. Link to comment Share on other sites More sharing options...
eos 10 fan Posted May 10, 2007 Share Posted May 10, 2007 I have a nagging feeling that this is a known issue with early versions of the 24-70L. A quick google search hasn't shown anything, but I'll keep looking. What is your lens' serial #? Link to comment Share on other sites More sharing options...
eos 10 fan Posted May 10, 2007 Share Posted May 10, 2007 You will need to find your len's 'date code', not serial # (my O0ops). Here is Canon's Chuck Westfall's info from RG (03/31/04): 1. The EF 24-70mm f/2.8L USM originally went on sale in the USA in November, 2002. 2. The factory made a "running change" to the design of the name ring attachment system in April, 2003. 24-70L lenses manufactured since the beginning of April, 2003 have already been modified. This was a gap of approximately 5 months rather than 2 as I originally said. 3. The manufacturing code, which is engraved into or printed on the black ring surrounding the rear element of the lens, is UR0402 or higher for modified lenses. If you purchased your EF 24-70L lens within the last 12 months, chances are good that your lens has already been modified. 4. The repair procedure for the name ring on EF 24-70L lenses manufactured before the modification involves three screws, not just one. The holes to accept these screws are already there, so no drilling is required. As a reminder, Canon does not recommend customers to send in their early-production EF 24-70L lenses for "preventative maintenance" if the name ring is intact. Also, decisions on whether or not to charge customers for the repair of a name ring are made exclusively by the Canon Factory Service Center upon physical examination of the lens and warranty status. Chuck Westfall, Canon U.S.A., Inc. -- Link to comment Share on other sites More sharing options...
andreimoment Posted May 11, 2007 Author Share Posted May 11, 2007 Thank you, Dan! The lens is UR0201 so it will need the repair. I will be sending it to canon's service in Irvine, CA as soon as my shooting schedule allows. I contacted them today and they said that it takes them 3 to 4 days to get to an item after it arrives at their location so I'd expect a turnaround of 2 weeks or more. A question: I bought the lens used on eBay and I don't have the warranty card. How should I approach the matter with canon so that they repair it at no cost (as it seems that this is a design flaw). Regards -- Andre Link to comment Share on other sites More sharing options...
serguei_fenev Posted May 11, 2007 Share Posted May 11, 2007 Andre, Mine was not under warranty either - it did expire before I've got the problem. Probably because it was a clear design issue, Canon didn't charge anything to fix it. This too could be your case. Link to comment Share on other sites More sharing options...
lars_oeh Posted June 24, 2007 Share Posted June 24, 2007 Hi Andre. I had exact the same problem, and this morning, I fixed it myself. It is possible to remove the red ring and thereby expose the three small holes. To remove the ring, i used a very little umbracho tool and a piece of stiff plastic. The umbracho tool must be small enough to fit in the holes under the red ring, and the plastic piece must be stiff enough to lift the umbracho and the red ring. when the red ring is lifted, You are able to remove it with the finger nails. Now You can see 2/3 of the small holes. I used a very small flat-nose pliers to move the edge that covered the holes. When the edge is moved, the small pins can be pressed into the holes. Finally the red ring can be moved back and the edge can be pressed back. I pressed the edge back first and then the red ring last. Now my front lens ring is not lose anymore, but I have 3 small marks as a reminder of this operation. I am NOT a professional, and the way I fixed my problem may be a very wrong way. I also do not know when it will fall a part again, but right now I am happy, that my lens is working again. The three little marks? - well, I'll have to live with it... Good luck, and be very careful if You want to try fixing it Yourself. /Lars O Link to comment Share on other sites More sharing options...
andreimoment Posted July 31, 2007 Author Share Posted July 31, 2007 An update. Sent the lens and spoke to Canon after they sent me a $158 estimate. They have no advisory for this issue so I'll be paying full price. Thay'll clean the lens and return it to factory specs so I guess it's worth it. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now