Comparison of Sigma 17-35mm f/2.8-4 EX DG Aspherical HSM and Tokina 12-24mm f/4 AT-X 124 AF PRO DX II

Attribute	Tokina 12-24mm f/4 AT-X 124 AF PRO DX II ×	Sigma 17-35mm f/2.8-4 EX DG Aspherical HSM ×
Filter Size (mm)	77	77
Notes	Available AF Mounts: Canon and Nikon Digital Only. Built-in AF motor for use with all Nikon DSLRs including Nikon D40, D40x, D60. Included Accessorie	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax
Closest Focus (m)	0.3	0.27
Magnification Ratio (x)	0.125	0.22
Type	Wide Zoom	Wide Zoom
Length (mm)	89.5	88.7
APS Equivalent	1.5x: 18-36mm;1.6x: 19.2-38.4mm	1.5x: 25.5 - 52.5mm; 1.6x: 27.2 - 56mm
Zoom System	Rotary	Rotary
Image Circle	APS-C	35mm
Focal Length (mm)	12.00 - 24.00	17.00 - 35.00
Brand	Tokina	Sigma
Name	Tokina 12-24mm f/4 AT-X 124 AF PRO DX II	Sigma 17-35mm f/2.8-4 EX DG Aspherical HSM
Weight (g)	540	560
Aperture (f)	4.00 - 22.00	2.80 - 22.00
Diaphragm Blades	9	8
Diagonal Angle of View (degree)	61.00 - 99.00	63.40 - 103.70
Lens Construction	13 elements in 11 groups, including 2 aspherical elements	16 elements in 13 groups, including 2 aspherical and 1 SLD elements
Diameter (mm)	84	83.5
Focus Details	Internal with One-Touch Focus Clutch mechanism; DC AF motor	Internal Focus; HSM with full-time manual override