Comparison of Sigma 14mm f/2.8 EX Aspherical HSM and Tokina 16-28mm f/2.8 FF Opera

Attribute	Tokina 16-28mm f/2.8 FF Opera ×	Sigma 14mm f/2.8 EX Aspherical HSM ×
Diagonal Angle of View (degree)	76.90 - 107.10	114.20
Notes	Available AF Mounts: Canon EF, Nikon F; Included Accessories: lens cap, fixed petal type hood.	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Closest Focus (m)	0.28	0.18
Magnification Ratio (x)	0.19	0.2
Type	Wide Zoom	Wide Prime
Focus Details	Internal with SD-M (Silent Drive Module) DC motor; One-Touch Focus Clutch Mechanism	Internal focus; HSM with full-time manual override
APS Equivalent	1.5x: 24 - 42mm; 1.6x: 25.6 - 44.8mm	1.5x: 21mm; 1.6x: 22.4mm
Diaphragm Blades	9	7
Image Circle	35mm	35mm
Focal Length (mm)	16.00 - 28.00	14.00
Brand	Tokina	Sigma
Name	Tokina 16-28mm f/2.8 FF Opera	Sigma 14mm f/2.8 EX Aspherical HSM
Weight (g)	940	630
Diameter (mm)	89	82
Length (mm)	133.5	91
Zoom System	Rotary	-
Lens Construction	15 elements in 13 groups, including 3 SD and 3 aspherical elements	14 elements in 10 groups, including 2 aspherical and 2 SLD elements