Comparison of Sigma 70-200mm f/2.8 DG OS HSM Sports and Tamron 70-200mm f/2.8 Di VC USD G2 SP (Model A025)

Attribute	Sigma 70-200mm f/2.8 DG OS HSM Sports ×	Tamron 70-200mm f/2.8 Di VC USD G2 SP (Model A025) ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	82	77
Notes	Optical Image Stabilization; Available AF Mounts: Sigma SA, Canon EF, Nikon F	Moisture-Proof and Dust-Resistant Construction; Image Stabilized (CIPA rated to 5-stops); Available mounts: Canon EF, Nikon F
Closest Focus (m)	1.2	0.95
Magnification Ratio (x)	0.21	0.16
Zoom System	Rotary; Internal	Rotary
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	1.5x: 105 - 300mm; 1.6x: 112 - 320mm	1.5x: 105 - 300mm; 1.6x: 112 - 320mm
Diaphragm Blades	11	9
Image Circle	35mm	35mm
Focal Length (mm)	70.00 - 200.00	70.00 - 200.00
Brand	Sigma	Tamron
Name	Sigma 70-200mm f/2.8 DG OS HSM Sports	Tamron 70-200mm f/2.8 Di VC USD G2 SP (Model A025)
Weight (g)	1805	1500
Diaphragm Blades Type	rounded	rounded
Lens Construction	24 elements in 22 groups, including 1 SLD and 9 FLD elements	23 elements in 17 groups, including 1 XLD (Extra Low Dispersion) and 5 LD (Low Dispersion) elements; eBAND Coating; Fluorine Coating
Diagonal Angle of View (degree)	12.30 - 34.30	12.30 - 34.30
Length (mm)	202.9	193.8
Diameter (mm)	94.2	88
Focus Details	Internal; HSM with full-time manual override; Focus mode, hold and limit switches	Internal using USD (Ultrasonic Silent Drive) motor with continuous manual focus mechanism; AF/MF switch; AF limiter switch