Quote Originally Posted by andnowimbroke View Post
Why are some lenses with an image stabilizer sharper than the non-IS version, and others are just the opposite? I can't believe it's just the implementation of said stabilizer. Take the different versions of 70-200mm in both the f4 and f2.8. Same focal range, but opposite results. Is it a price issue? When making a product, you set a time/price limit. Maybe they reached the max value before finishing the fine tuning. Could it have been a bad copy or two that was used it the test for the site? He's pretty meticulous. If I was thinking ahead, I would have checked to make sure the IS system on the two versions of the 70-200 were the same, and also took the f2.8 model to f4 and seeing if it followed the same pattern. Just curious.
I am sure if you wanted the answer to this question you would have to talk Canon. Most likely you would need to talk to the designers as I would bet you can’t find a sales rep that could answer it.

But…your question is confusing. Since there are five versions of this lens available. The 70-200mm 2.8 IS I & II, the 2.8 non IS, the F4 IS and non IS. Which are you comparing and which were the opposite results?

Could it be that the 2.8 non IS is the same as the version I and not the new version?