Reviews and Problems with Canon EF 70-200mm f/4L IS USM
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inherent focusing issue !!!
alex the ladd, B&H Photo
2 May 2014
Excerpt: There is a major manufacturing defect with this lense You can not focus this lens manually if you point it up at more than 45 degrees. I've tried several of these lenses and have had the same bad results. Canon WILL NOT take responsibility for it if you don't notice it within your warranty period. Double check you lense for this issue and return it!!! Canon does not consider it a manufacturing flaw , even though it obviosly is.
Excerpt: Maybe I should not have ordered the "refurbished by Canon" unit from Adorama, but I was convinced by other reviewers that this would be a great travel and landscape lens. I could not have been more wrong! On my 5DII I have never seen anything close to the sharpness from this lens that I have come to expect from other high-quality lenses. Autofocus only hits the target about 25% of the time, and (relative) sharpness only appears in the center of the image.