Comparison of Olympus 70-300mm ƒ/4-5.6 ED Zuiko Digital and Tamron SP AF 200-500mm f/5-6.3 Di LD IF

Attribute	Tamron SP AF 200-500mm f/5-6.3 Di LD IF ×	Olympus 70-300mm ƒ/4-5.6 ED Zuiko Digital ×
Magnification Ratio (x)	0.2	0.5
Filter Size (mm)	86	58
Length (mm)	227	127
Closest Focus (m)	2.5	1.2
Diameter (mm)	93.5	80
Front Element Rotation	-	-
Focal Length (mm)	200.00 - 500.00	70.00 - 300.00
Diagonal Angle of View (degree)	5.00 - 12.00	4.10 - 18.00
Brand	Tamron	Olympus
Image Circle	Image Circle	Four-Thirds
Name	Tamron SP AF 200-500mm f/5-6.3 Di LD IF	Olympus 70-300mm ƒ/4-5.6 ED Zuiko Digital
Weight (g)	1237	620
Type	Telephoto Zoom	Telephoto Zoom
Notes	Available mounts: Canon, Minolta, Nikon	Included Accessores: Lens Hood
Diaphragm Blades	9	9
Aperture (f)	5.00 - 32.00	4.00 - 22.00
Lens Construction	13 elements in 10 groups, including two LD (Low Dispersion) elements	14 elements in 10 groups, including 3 ED elements
Zoom System	Rotary	Rotary
Focus Details	Internal	AF or MF
APS Equivalent	1.5x: 300 - 750mm; 1.6x: 320 - 800mm	-
35mm Equivalent	-	140 - 600mm