Comparison of Sigma APO 50-150mm f/2.8 II EX DC HSM and Tamron 70-200mm f/2.8 Di LD IF Macro SP AF

Attribute	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF ×	Sigma APO 50-150mm f/2.8 II EX DC HSM ×
Filter Size (mm)	77	67
Notes	Available mounts: Canon, Nikon, Pentax, Sony; Included accessories: Petal-shaped lens hood	Available AF Mounts: Sigma, Canon, Nikon, Pentax, Sony; Included Accessories: Case, Lens Hood (LH850-01).
Closest Focus (m)	0.95	1
Magnification Ratio (x)	0.32	0.19
Type	Telephoto Zoom	Telephoto Zoom
Length (mm)	194.3	140.2
APS Equivalent	1.5x: 105 - 300mm; 1.6x: 112 - 320mm	1.5x: 75 - 225mm; 1.6x: 80 - 240mm
Zoom System	Rotary	Rotary
Image Circle	35mm	APS-C
Focal Length (mm)	70.00 - 200.00	50.00 - 150.00
Brand	Tamron	Sigma
Name	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF	Sigma APO 50-150mm f/2.8 II EX DC HSM
Weight (g)	1100	780
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	12.30 - 34.30	9.50 - 27.90
Lens Construction	18 elements in 13 groups, including 3 LD (low dispersion) elements	18 elements in 14 groups, including 4 SLD elements
Diameter (mm)	89.5	76.5
Focus Details	Internal Focusing; One-touch AF/MF Switchover mechanism (for Canon and Nikon only)	HSM (Hyper Sonic Motor) with full-time manual focus override