IS blurring : does your 24-105mm f4 L have this problem?

Started Jan 10, 2013 | Discussions thread
BRUCEK56 Contributing Member • Posts: 858
Re: Survey results : 2nd update

LeeDempsey wrote:

Thanks for updating this Tim.

If anyone who has successfully gotten Canon to fix this issue on their lens would be willing to share their Repair Order RN number, I would appreciate it. I would like to send Canon multiple examples of how to correctly fix it. I saw RN332118 (Peter) as one example. Mine is RN564819 -- but of course it's not resolved at this point.



Hi Lee,

Below is my post IN THIS THREAD from a year ago. It lists my RN repair # as well as the actual parts needed to repair the I.S. problem that were listed on the returned lens repair order.

By the way while I still have this lens I purchased the new Sigma 24-105 F4 and it is better in every way than the Canon lens. Sharper wide open especially the corners, better built and one half a stop better light transmission (as per DXO). It also has extremely consistent and accurate focus especially using the outer focus points on my 1DX.


Sure problem.

However for some reason Canon in their return work order doesn't really describe the problem as I did when I sent it in.

"Description of Problem/Symptoms they indicated "aperture erratic/soft images/check and repair all functions"

This is not unusual. Many times I have sent lenses or cameras into Canon and their description of the problem is somewhat vague.....even though my description is very specific.

Most important and what I did was to print out the actual examples in the first post in this thread.....including the other posts to show Canon this is not an isolated problem with only my lens.....along with a detailed explanation.

With that in mind the Repair ID Number was RN340356.


: 2) PCB ASSEMBLY, MAIN ............PART # YG2-2197-000

I did also ask them to check for softness at 105mm on the left side.

I would assume the "PCB ASSEMBLY, MAIN" is the circuit board that is needed to repair the I.S. problem........although you might want to list both because I.S. is mentioned in # 1.

Good luck!
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