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.
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!