Comparison of Sigma 14mm f/2.8 EX Aspherical HSM and Tamron SP AF 14mm f/2.8 Aspherical IF

Attribute	Sigma 14mm f/2.8 EX Aspherical HSM ×	Tamron SP AF 14mm f/2.8 Aspherical IF ×
Notes	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax	Available AF Mounts: Canon, Minolta, Nikon, Pentax; Included Accessories: Lens Hood, Case
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Closest Focus (m)	0.18	0.2
Magnification Ratio (x)	0.2	0.15
Length (mm)	91	89
Focus Details	Internal focus; HSM with full-time manual override	Internal
APS Equivalent	1.5x: 21mm; 1.6x: 22.4mm	1.5x: 21mm; 1.6x: 22.4mm
Type	Wide Prime	Wide Prime
Image Circle	35mm	35mm
Focal Length (mm)	14.00	14.00
Brand	Sigma	Tamron
Name	Sigma 14mm f/2.8 EX Aspherical HSM	Tamron SP AF 14mm f/2.8 Aspherical IF
Weight (g)	630	661
Diagonal Angle of View (degree)	114.20	113.80
Diaphragm Blades	7	5
Diameter (mm)	82	87
Lens Construction	14 elements in 10 groups, including 2 aspherical and 2 SLD elements	14 elements in 12 groups, including 2 hybrid aspherical elements