For the first time ever, dpreview.com is offering a prize for one of their photography challenges!

Send in your best Travel or Nature shot and you could win a superb Tamron SP 17-50MM F/2.8 Di II XR VC LD Aspherical (IF), which sets high-performance DSLRs free with SP engineering, F/2.8 maximum aperture and Tamron VC (image stabilisation).

The winner of this challenge (as decided by public vote) will receive a Tamron SP 17-50MM F/2.8 Di II XR VC zoom lens (in Canon EF-S or Nikon mount). If the winner is a full frame user, a Tamron SP 28-75mm F/2.8 will be substituted. No other substitutions will be offered. No cash alternative is available. Prizes are non transferable and non refundable.

Competition open to any registered dpreview.com member, anywhere in the world, so what are you waiting for? Deadline for submissions is Sunday, 23rd October, with no rules on capturing date or post-processing.