Dave Smart's reviews
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Tamron 18-270mm f/3.5-6.3 Di II VC LD Aspherical IF Macro AF
9 out of 10 points and recommended15x zoom range. Vibration Compensation.Short manual focus adjustment. Not USMI've only had the lens a couple of days but already love it.
reviewed November 22nd, 2008 (purchased for $592)
I have a Canon 40D on which I've used a Canon 18-55 and a Canon 75-300 III USM.
The Tamron's vibration compensation works a treat. It takes about 1 second for the VC to be fully up and running.
Focusing is not USM but it's good and reasonably quiet.
Zooming is slightly stiff between 50-100 but no big deal.
Sample shots on http://www.flickr.com/photos/dave-smart/