THE CONTENDERS

Sigma 10-20mm f/4-5.6 EX DC HSM £350, $430

Tamron SP AF 10-24mm f/3.5-4.5 Di II £370, $500

Sigma 10-20mm f/3.5 EX DC HSM £399, $650

Tokina AT-X 12-28mm f/4 Pro DX £540, $500

Sigma 8-16mm f/4.5-5.6 DC HSM £550, $700

Tokina AT-X 11-16mm f/2.8 PRO DX II £599, $535

Nikon AF-S DX 10-24mm f/3.5-4.5G £640, $780

Nikon AF-S DX 12-24mm f/4G IF-ED £840, $1100