Comparison of Olympus 300mm f/2.8 Zuiko Digital and Tamron SP AF 300mm f/2.8 LD IF

Attribute	Olympus 300mm f/2.8 Zuiko Digital ×	Tamron SP AF 300mm f/2.8 LD IF ×
Diagonal Angle of View (degree)	4.20	8.00
Diameter (mm)	129	120
Notes	Includes Lens Hood (LH-120) and Lens Case (LSH-1738)	Available AF Mounts: Canon, Minolta, Nikon; Included Accessories: Lens Hood, Case
Aperture (f)	2.80 - 22.00	2.80 - 32.00
Type	Telephoto Prime	Telephoto Prime
Magnification Ratio (x)	0.15	0.141
Diaphragm Blades	9	9
APS Equivalent	-	1.5x: 450mm; 1.6x: 480mm
Image Circle	Image Circle	35mm
Focal Length (mm)	300.00	300.00
Brand	Olympus	Tamron
Name	Olympus 300mm f/2.8 Zuiko Digital	Tamron SP AF 300mm f/2.8 LD IF
Weight (g)	3300	2800
35mm Equivalent	600mm	-
Lens Construction	13 elements in 11 groups, including 3 ED elements	10 elements in 7 groups, including 2 LD elements
Focus Details	-	Internal; Focus ring slides back and forth to switch between AF and MF
Length (mm)	282	215.9
Filter Size (mm)	-	43
Closest Focus (m)	2	2.5