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Tamron 18-250mm F/3.5-6.3 XR Di II LD Aspherical (IF) AF

18_250mm
Review Date: Feb 10, 2011 Recommend? no | Price paid: $480.00 | Rating: 5 

Pros: price, versatility
Cons:
soft, slow AF, chromatic abberation at long FLs

I am disappointed with this lens and would NOT recommend it to anyone. I'm a semi-pro shooter using this lens on a Pentax K20D. I get great results from all my lenses but this one. I have calibrated front/back focus as well as possible and am still disappointed in the sharpness. The AF is slow and hunts a LOT (and I do mean a LOT). Chromatic aberrations are really bad at longer FLs and wider apertures. Lens creep is REALLY bad (it has a lock, but Iíd prefer not to use it). In hindsight, I donít know how or understand why this lens won so many awards or got such great reviews (which are how I based my purchase decision). For the new or recreational shooter with lower expectations, maybe this lens will do. But if youíre an experienced shooter looking for decent AF and good sharpness, look elsewhere. As for me, Iím sticking with Sigma and Pentax lenses.