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Canon Lens Teardown-70-200mm

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by SantaFeJoe on Sat Sep 01, 2018 9:02 am

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Here’s a link to Lens Rentals teardown of a Canon 70-200mm lens to see if the new model is really any different from the old. Two things I found interesting are that: #1. The screws under the tripod ring can loosen and cause the tripod ring to bind or drag. #2. The IS should be shut off during transportation so there is less chance of damaging the unit when it is not secured, also mentioned by DPreview.

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

https://www.dpreview.com/articles/9524258015/lensrentals-tears-down-canon-ef-70-200mm-f2-8-mark-iii-and-mark-ii?slide=5

Joe

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by Ed Cordes on Sun Sep 02, 2018 7:31 pm

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SantaFeJoe wrote: #2. The IS should be shut off during transportation so there is less chance of damaging the unit when it is not secured, also mentioned by DPreview.
Joe

Is this true for all lenses? I never turn the IS of when traveling or transporting.

Remember, a little mild insanity keeps us healthy

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by SantaFeJoe on Sun Sep 02, 2018 8:47 pm

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Ed Cordes wrote:
SantaFeJoe wrote: #2. The IS should be shut off during transportation so there is less chance of damaging the unit when it is not secured, also mentioned by DPreview.
Joe
Is this true for all lenses? I never turn the IS of when traveling or transporting.

In the comments below the article, Roger addresses this very question:

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

Joe

Learn the rules like a pro, so you can break them like an artist. -Pablo Picasso

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by adamsti on Mon Sep 03, 2018 9:30 am

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I read the comments, but in the 14 years I have owned IS lenses I have never turned it off, and I have never had a problem, and I am very hard on my gear. The only time I damaged IS is when a camera fell off a tripod. It would seem to be a very, very rare problem.

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by adamsti on Mon Sep 03, 2018 9:36 am

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What is interesting, is that optically there seems to be no difference at all. I'll be hanging on to my II for quite a while.

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by Ed Cordes on Mon Sep 03, 2018 5:51 pm

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I also was interested n the comments section that LR uses protective filters on the new lenses. After years of resistance I switched to using B&W clear or UV filters on my lenses after noticing a small coating defect on one. I began to analyse the conditions in which i photographed and traveled and decided to try filters. Now about three years later my eye sees no degradation of IQ. I feel much more comfortable and would rather buy a new filter than a new front element. Of course, I think using high quality filters is important.

Remember, a little mild insanity keeps us healthy

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