70-200 f/2.8 III Teardown by Roger Cicala

Started Aug 30, 2018 | Discussions thread
RCicala
RCicala Contributing Member • Posts: 613
Re: 70-200 f/2.8 III Teardown by Roger Cicala
2

herion wrote:

RCicala wrote:

MarshallG wrote:

https://www.lensrentals.com/blog/2018/08/lens-teardowns-and-comparisons-of-the-canon-70-200mm-f2-8-is-ii-and-iii/

Summary:
1) Construction of version II and III is identical
2) The only difference between versions II and III are a slightly different paint color and a change to a fluorine coating on version III. Roger believes the fluorine coating on the III lens is easily scratched or marred, requiring front element replacement. He recommends the version II over the III for this reason. He also recommends a lens filter if you have a Canon lens with the fluorine coatings, such as the 24-70 f/2.8 II.
3) This part was a little vague, but he seemed to say that transporting the lens with the IS turned OFF can potentially cause damage of some plastic posts within the stabilizer assembly.

Once again, Roger and Lens Rentals prove to be a valuable and wonderful resource to the photography community. Thank you, Roger!

I wrote that poorly. You SHOULD transport with IS turned off - but you have to turn it off while mounted to a camera to lock the IS unit down.

Roger - would that be the best practice for *ANY* Canon lens with IS? Turn off IS, then remove from camera?

Yes. We do it with every one. The most obvious 'rattlers' are the 70-200 f/2.8 and 100mm f/2.8 IS, but it's good practice. We think it's so important that it's checked twice: once when it returns from rental, and as the last check again before it's packed for it's next shipping.

That being said, damage to the IS isn't frequent even if it's left off (for example, most customers ship them back unlocked), perhaps 1 in 1,000 shipments, maybe less. But for us that can mean several broken IS units a month.

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