He was wearing a grey bomber-style jacket with black lining and hood, light blue bleached jeans that were ripped at the bottom and grey hi-top trainers when he went missing.

BBC: Mother makes plea over missing son Ross Ramsay

The dedicated bayonet lens hood (LH3-01) can be attached to block out extraneous light.

ENGADGET: Sigma DP3 Merrill packs a Foveon X3 sensor and a fixed F2.8, 75mm-equivalent lens