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

Attribute	Tamron 70-200mm f/2.8 Di VC USD G2 SP (Model A025) ×	Sigma 70-200mm ƒ/2.8 EX DG OS HSM APO ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	77	77
Notes	Moisture-Proof and Dust-Resistant Construction; Image Stabilized (CIPA rated to 5-stops); Available mounts: Canon EF, Nikon F	Image Stabilized. Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony. Included Accessories: Case, Petal-type Hood (LH850-02), Hood Adapter, Tripo
Closest Focus (m)	0.95	1.4
Magnification Ratio (x)	0.16	0.13
Zoom System	Rotary	Rotary with lock; Internal
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	9	9
Image Circle	35mm	35mm
Focal Length (mm)	70.00 - 200.00	70.00 - 200.00
Brand	Tamron	Sigma
Name	Tamron 70-200mm f/2.8 Di VC USD G2 SP (Model A025)	Sigma 70-200mm ƒ/2.8 EX DG OS HSM APO
Weight (g)	1500	1430
Diaphragm Blades Type	rounded	rounded
Lens Construction	23 elements in 17 groups, including 1 XLD (Extra Low Dispersion) and 5 LD (Low Dispersion) elements; eBAND Coating; Fluorine Coating	22 elements in 17 groups, including 3 SLD and 2 FLD elements
Diagonal Angle of View (degree)	12.30 - 34.30	12.30 - 34.30
Length (mm)	193.8	197.6
Diameter (mm)	88	86.4
Focus Details	Internal using USD (Ultrasonic Silent Drive) motor with continuous manual focus mechanism; AF/MF switch; AF limiter switch	Internal; HSM with full-time manual override