100-400 V1

[dgatwood]

Feel your pain bud. I think anyone who owns that particular lens has had the "I wonder if this is one of the lousy ones" feeling at some point.

I remember when I went through that with my 70–300L. I was getting bizarre double images on every shot. Then I tried the same shots, but without pointing through the train windows, and I couldn't reproduce the problem. Apparently, double pane safety glass windows really wreak havoc on lenses at long focal lengths. *sigh*

 

[meywd]

Well, now that i have had the 70-200mm f/2.8 IS II for a while, i can post a perfect shot, it has been cloudy lately and most shots were taken right after sunrise, so there was barely enough light, also since i am still learning to use the 5D Mark III, and after getting feedback from you guys, I was mostly shooting with 1/2000 and auto ISO which lead to many ISO 12800 shots, which lead to lots of noise and soft images, anyway now i have a good light shot from a close space to compare with the 100-400, i am using the 2xTC II, btw the following shot was taken with ML dual ISO, Converted to DNG using the dual ISO LR plugin then sharpening set to 0 and exported:

400mm f/5.6 1/1250 ISO320

 

[Ryan85]

I personally feel like the 2x teleconverters take away to much sharpness. I rather just use the 100-400 v1 apposed to the 70-200 with a 2x extender. In my experience I get sharper shots that way.