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Russell H.
Russell H., Service Tech
Category: Camera and Video
Satisfied Customers: 9515
Experience:  8+ years of professional experience
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I have a 70-200 f2.8 IS USM and the IS is bouncing up and

Customer Question

Hello, I have a 70-200 f2.8 IS USM and the IS is bouncing up and down when I have it turned on and in portrait mode but only on its left side down. And it only flips rapidly like that not even half the time. I sent it to Canon and they said it needed a new IS system all totaling above 800$ with labor. I researched online and found I could buy a new IS part on eBay for 220$ and read how to replace it on YouTube videos. It looks fairly simple with only the sensors and putting the connectors back correctly being the main obstacle. Am I being foolish on an 8 year old lens or is this practical? And since the lens was returned and hasn't been used a new problem arose. After it was opened(?)/ examined* by Canon, its focus won't reach into the 150mm mark & beyond, meaning it will not turn past that area as it seems stuck on something loose. Will I run into any foreseeable problems such as ruining the plastic focus barrel or the stuck housing that arose b/c of their tech's analysis? Thanks, Rya
Submitted: 9 months ago.
Category: Camera and Video
Expert:  Russell H. replied 9 months ago.

Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.

The stuck portion could be owing to grit shaken loose by the repair, or jarred loose by the lens (or the lens and the camera) being dropped at any time.

Or it could be owing to your having used the camera in a gritty or sandy area:

How old is the camera? in months or years since you bought it.

Has the camera been dropped or otherwise subjected to mechanical shock(s) in its lifetime?

Has the camera been operated in or subjected to, temperatures below 32 degrees F (freezing point) or above about 100 degrees F ?

Has it ever been subjected to a humidity higher than 85 % or gotten wet ?

Has the camera been operated in a gritty or sandy environment, such as a beach, a seaside, a construction site, or the like?

The repair on an 8 year old lens is a delicate one. You could try it, but being such fine work and such fine machining etc., it would be risky, unless you went slowly and carefully, and observed anti-static precautions at all times when handling either the opened lens and the electronics you are replacing and the replacement electronics you are putting in. And also, you would need to do the work in a clean area - no pets, no pet dander, no dust, etc. etc. And not touch the lenses, at all, of course.