My tamron also has a lock & it works great - unless I forget to unlock it before taking photos. You might check to see if your zoom has a lock - I had the lens for 4 years before I found out about the lock - talk about feeling totally unobservant.
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Camera: Canon 50d
Lens: 50 mm 1.8; 28-300 3.5-5.6; 70-200 2.8 IS; 17-55 2.8
Software: Adobe CS4; Lightroom 2
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