Comparison of Sigma 70-200mm ƒ/2.8 EX DG OS HSM APO and Tamron 70-200mm ƒ/2.8 Di VC USD SP (Model A009)

Attribute	Sigma 70-200mm ƒ/2.8 EX DG OS HSM APO ×	Tamron 70-200mm ƒ/2.8 Di VC USD SP (Model A009) ×
Aperture (f)	2.80 - 22.00	2.80 - 32.00
Filter Size (mm)	77	77
Notes	Image Stabilized. Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony. Included Accessories: Case, Petal-type Hood (LH850-02), Hood Adapter, Tripo	Available mounts: Canon, Nikon, Sony; Optical Image Stabilization; Included Accessories: Flower-shaped lens hood, detachable tripod mount
Closest Focus (m)	1.4	1.3
Magnification Ratio (x)	0.13	0.13
Zoom System	Rotary with lock; 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	9	9
Image Circle	35mm	35mm
Focal Length (mm)	70.00 - 200.00	70.00 - 200.00
Brand	Sigma	Tamron
Name	Sigma 70-200mm ƒ/2.8 EX DG OS HSM APO	Tamron 70-200mm ƒ/2.8 Di VC USD SP (Model A009)
Weight (g)	1430	1470
Diaphragm Blades Type	rounded	rounded
Lens Construction	22 elements in 17 groups, including 3 SLD and 2 FLD elements	23 elements in 17 groups, including 1 special XLD (Extra Low Dispersion) and 4 LD (Low Dispersion) elements
Diagonal Angle of View (degree)	12.30 - 34.30	12.30 - 34.30
Length (mm)	197.6	196.7
Diameter (mm)	86.4	85.8
Focus Details	Internal; HSM with full-time manual override	Internal Focusing; USD (Ultrasonic Silent Drive) with continuous manual focus mechanism