Comparison of Sigma 20mm ƒ/1.4 DG HSM Art and Tamron SP 15-30mm f/2.8 Di VC USD G2 (Model A041)

Attribute	Sigma 20mm ƒ/1.4 DG HSM Art ×	Tamron SP 15-30mm f/2.8 Di VC USD G2 (Model A041) ×
Notes	Available AF Mounts: Sigma SA, Canon EF, L-Mount, Nikon F, Sony E; Compatible with Sigma's USB Dock and Mount Conversion Service	VC Image Stabilization (4.5 stops); Available AF mounts: Canon EF, Nikon F. Integrated flower-shaped hood.
Aperture (f)	1.40 - 16.00	2.80 - 22.00
Closest Focus (m)	0.28	0.28
Magnification Ratio (x)	0.14	0.2
Type	Wide Prime	Wide Zoom
Focus Details	HSM (Hypersonic Motor) with full-time manual focus override	Internal focusing; Ultrasonic Silent Drive USD motor with full-time MF mechanism; Dual MPU (Micro-Processing Unit) system
APS Equivalent	1.5x: 30mm; 1.6x: 32mm	1.5x: 22.5 - 45mm; 1.6x: 24 - 48mm
Diameter (mm)	129.5	98.4
Image Circle	35mm	Image Circle
Focal Length (mm)	20.00	15.00 - 30.00
Brand	Sigma	Tamron
Name	Sigma 20mm ƒ/1.4 DG HSM Art	Tamron SP 15-30mm f/2.8 Di VC USD G2 (Model A041)
Weight (g)	963	1110
Diaphragm Blades Type	rounded	circular
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	94.50	71.60 - 110.50
Length (mm)	91.4	145
Zoom System	-	Rotating
Lens Construction	15 elements in 11 groups, including 1 double-sided aspherical, 2 FLD and 5 SLD elements	18 elements in 13 groups, including 2 molded glass aspherical elements, 1 XGM (eXpanded Glass Molded) aspherical element and 3 LD elements