The tamron 200-500mm has an average review score of 90%

Score (%):
Tamron SP AF200-500mm f/5-6.3 Di LD (IF)
What digital camera reviews the Tamron SP AF200-500mm f/5-6.3 Di LD (IF) lens...
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90

Tamron 200-500mm f/5-6.3 Di LD IF SP AF
Multiple user reviews on slrgear.com
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80

Tamron SP AF 200-500mm f5-6.3 Di LD
The longer the focal length, the bigger the lens. And if you need a 500mm lens (800mm equivalent when fitted to a digital SLR), you can’t expect it to fit in the average gadget bag. To its credit, the Tamron 200-500mm is pretty compact for a lens of this range. While it’s quite long at 227mm it's also slim, only flaring out slightly at the front end. Interestingly, Sigma’s 50-500mm is a lot fatter, but a lot shorter. It also remains a good deal shorter when both lenses...
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100