Why is this photo not sharp ?

Started Jan 11, 2012 | Discussions thread
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red sled
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Why is this photo not sharp ?
Jan 11, 2012

Shot this near the lake this morning. Looked good on the display and on my laptop... but when I crop it doesn't seem so sharp. I see the info says 300mm, f/5.6, and 1/2000 speed. I've read that this lens is sharpest at f/7-9. Is this the culprit ?

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