Comparison of Sigma 20mm ƒ/1.4 DG HSM Art and Tamron SP AF 14mm f/2.8 Aspherical IF

Attribute	Sigma 20mm ƒ/1.4 DG HSM Art ×	Tamron SP AF 14mm f/2.8 Aspherical IF ×
Aperture (f)	1.40 - 16.00	2.80 - 22.00
Magnification Ratio (x)	0.14	0.15
Notes	Available AF Mounts: Sigma SA, Canon EF, L-Mount, Nikon F, Sony E; Compatible with Sigma's USB Dock and Mount Conversion Service	Available AF Mounts: Canon, Minolta, Nikon, Pentax; Included Accessories: Lens Hood, Case
Focus Details	HSM (Hypersonic Motor) with full-time manual focus override	Internal
Closest Focus (m)	0.28	0.2
Lens Construction	15 elements in 11 groups, including 1 double-sided aspherical, 2 FLD and 5 SLD elements	14 elements in 12 groups, including 2 hybrid aspherical elements
Length (mm)	91.4	89
Focal Length (mm)	20.00	14.00
APS Equivalent	1.5x: 30mm; 1.6x: 32mm	1.5x: 21mm; 1.6x: 22.4mm
Brand	Sigma	Tamron
Image Circle	35mm	35mm
Name	Sigma 20mm ƒ/1.4 DG HSM Art	Tamron SP AF 14mm f/2.8 Aspherical IF
Weight (g)	963	661
Type	Wide Prime	Wide Prime
Diaphragm Blades Type	rounded	-
Diaphragm Blades	9	5
Diagonal Angle of View (degree)	94.50	113.80
Diameter (mm)	129.5	87