Tamron is offering an F2.8 zoom to the winner of a Travel and Nature challenge on dpreview.com. The competition, open to any registered dpreview member, runs until October 24th. The winner will be decided by public vote over the following seven days. The winning photographer will receive a Tamron SP 17-50mm F/2.8 Di II XR VC LD Aspherical (IF) in Canon or Nikon mount (Full-frame shooters can request an unstabilized 28-75mm F2.8 instead), making this the first dpreview challenge with a competition prize.

Click here to enter the Tamron Prize Challenge: Travel and Nature