| http://www.w3.org/ns/prov#value | - For those who are deciding between this lens and the much larger and more expensive 200-400mm f4 VR (and based on email I have received there is a lot of folks in this category)...well...with exhaustive testing I found the two lenses almost identical in sharpness when shooting under real-world field conditions (on all overlapping focal lengths - and at all distances tested).
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