Comparison of Olympus 50-200mm f/2.8-3.5 ED SWD Zuiko Digital 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 ×	Olympus 50-200mm f/2.8-3.5 ED SWD Zuiko Digital ×
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades Type	-	circular
Filter Size (mm)	77	67
Notes	Available mounts: Canon, Nikon, Pentax, Sony; Included accessories: Petal-shaped lens hood	Dust and drip proof. Includes Lens Hood (LH-70C) and Lens Case (LSC-1220)
Focus Details	Internal Focusing; One-touch AF/MF Switchover mechanism (for Canon and Nikon only)	-
Type	Telephoto Zoom	Telephoto Zoom
Diaphragm Blades	9	9
Diameter (mm)	89.5	86.5
Image Circle	35mm	Image Circle
Focal Length (mm)	70.00 - 200.00	50.00 - 200.00
Brand	Tamron	Olympus
Name	Tamron 70-200mm f/2.8 Di LD IF Macro SP AF	Olympus 50-200mm f/2.8-3.5 ED SWD Zuiko Digital
Weight (g)	1100	995
Diagonal Angle of View (degree)	12.30 - 34.30	6.20 - 24.00
Lens Construction	18 elements in 13 groups, including 3 LD (low dispersion) elements	16 elements in 15 groups, including 3 ED elements
Zoom System	Rotary	Rotary
Closest Focus (m)	0.95	1.2
35mm Equivalent	-	100 - 400mm
Length (mm)	194.3	157
APS Equivalent	1.5x: 105 - 300mm; 1.6x: 112 - 320mm	-
Magnification Ratio (x)	0.32	0.21