Please Help 70-200MM 2.8L IS II USM Sharpness.

One more thing- this may be silly, but for the corners, did you focus on the corner, or just take a crop from a picture that was focused on the center? I ask because it is very hard to make sure the setup is completely square- at least for me. I always focus on the corner I plan to crop or I don

I did focus in the center, and when I focused in the corner and found that it appeared to be sharp. Even though it looked square, I dont think it was. I tried another copy of the 70-200 2.8L II and it was very close to this 70-200 2.8L II. I am going to do a lot more testing this weekend and let you guys know.


Thanks for All of the ongoing help!!!

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Originally Posted by Chris

I did focus in the center, and when I focused in the corner and found that it appeared to be sharp.

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Ah- in that case, don't condemn the lens until you've tried it focusing on the exact part of the picture you plan to test. :)


Let us know your results.

Hey Guys, The I the better part of 5 hours and shot lots of RAWs over the weekend. I used the kitchen and set several props on the island. I used a watch, fake plants, and a few other items. I found that the it is really hard to determine if there is a real problem. I almost think there might be a back focus issue. Part of the issue I have testing is that I have to move the camera slighty when changing the lens. My tripod dips forward under the weight of the mighty 2.8 so I have to use the tripod ring.


I am thinking about buying the Spyder Lenscal.....Is there a place I can send the Lens to test it out? Maybe a 3rd party?

Hi Chris-


It seems like you were on the right track before with your pictures of that printout you made. Can