70-200 IS f/2.8 or f/4 - Which is sharper?

Started Dec 29, 2007 | Discussions thread
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NorthernWave
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70-200 IS f/2.8 or f/4 - Which is sharper?
Dec 29, 2007

There seems to be question as to whether the 2.8 or 4 produces sharper photos. Some say the f/4 produces sharper images. I'm debating on which lens to purchase, so any insight into this would be great! I'm definitely leaning toward the 2.8 IS.

http://www.photozone.de/8Reviews/lenses/canon_70200_28is/index.htm

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