Comparison of Sigma 10-20mm f/4-5.6 EX DC HSM and Tamron 10-24mm f/3.5-4.5 Di II VC HLD (BO23)

Attribute	Tamron 10-24mm f/3.5-4.5 Di II VC HLD (BO23) ×	Sigma 10-20mm f/4-5.6 EX DC HSM ×
Aperture (f)	3.50 - 29.00	4.00 - 22.00
Filter Size (mm)	77	77
Notes	Moisture-Resistant Construction; Image Stabilized (CIPA rated to 4-stops); Included Accessories: Flower-shaped lens hood, lens caps	Available AF mounts: Sigma, Canon, Nikon, Four-Thirds, Pentax, Sony
Closest Focus (m)	0.24	0.24
Magnification Ratio (x)	0.19	0.15
Diameter (mm)	83.6	83.5
Type	Wide Zoom	Wide Zoom
APS Equivalent	1.5x: 15 - 36mm; 1.6x: 16 - 38.4mm	1.5x: 15 - 30mm; 1.6x: 16 - 32mm; 2.0x: 20 - 40mm
Diaphragm Blades	7	6
Image Circle	APS-C	Image Circle
Focal Length (mm)	10.00 - 24.00	10.00 - 20.00
Brand	Tamron	Sigma
Name	Tamron 10-24mm f/3.5-4.5 Di II VC HLD (BO23)	Sigma 10-20mm f/4-5.6 EX DC HSM
Weight (g)	440	470
Diagonal Angle of View (degree)	60.03 - 108.73	63.80 - 102.40
Lens Construction	16 elements in 11 groups, including 1 LD, 1 XLD, 1 aspherical and 1 hybrid aspherical element glass element; eBAND Coating; Fluorine Coating	14 elements in 10 groups, including three aspherical elements and three Special Low Dispersion (SLD) lenses
Zoom System	Rotary	Rotary
Length (mm)	84.6	81
Diaphragm Blades Type	circular	-
Focus Details	Internal with High/Low torque modulated Drive; AF/MF switch	Internal with HSM