The tamron 18-250mm has an average review score of 79.8%

Score (%):
Tamron 18-250mm f/3.5-6.3 Di II LD IF
When we originally tested this lens back in June of last year it was the longest of its type, though Pentax has caught up...
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84

Tamron 18-250mm f/3.5-6.3 Di II LD Aspherical IF Macro AF (Tested)
Multiple user reviews on slrgear.com
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82

Tamron AF 18-250mm f3.5-5.6 Di-II LD
The Tamron 18-250mm offers a huge 13.9x zoom range. That’s even longer than a fancy ‘super-zoom’ compact. It’s designed specifically for DSLRs with APS-C sized sensors, so once you’ve applied the usual focal factor, it equates to a 28-390mm. Not many photographers will regularly need to shoot wider or longer than that, so it makes a great everyday lens and an interesting alternative to a kit zoom and telephoto combination. This lens is available in Nikon, Canon, Pe...
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80

Tamron AF 18-250mm f/3.5-6.3 Di II LD Aspherical [IF] macro (Canon) - Review / Test Report
The full in-depth review from photozone.de
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73