Comparison of Canon EF 400mm ƒ/2.8L IS II USM and Olympus 300mm f/2.8 Zuiko Digital

Attribute	Canon EF 400mm ƒ/2.8L IS II USM ×	Olympus 300mm f/2.8 Zuiko Digital ×
Filter Size (mm)	52	-
Closest Focus (m)	1.7	2
Magnification Ratio (x)	0.17	0.15
Length (mm)	343	282
Focus Details	Inner focusing; Ultra-sonic Motor (USM), AF/PF/MF switch, Focus Preset, Range Limiter	-
Diaphragm Blades Type	rounded	-
Diagonal Angle of View (degree)	6.20	4.20
Image Circle	35mm	Image Circle
Focal Length (mm)	400.00	300.00
Name	Canon EF 400mm ƒ/2.8L IS II USM	Olympus 300mm f/2.8 Zuiko Digital
Brand	Canon	Olympus
Weight (g)	3900	3300
Type	Telephoto Prime	Telephoto Prime
Lens Construction	16 elements in 12 groups	13 elements in 11 groups, including 3 ED elements
Notes	Image Stabilization (4-stops); Included Accessories: lens hood and hard case.	Includes Lens Hood (LH-120) and Lens Case (LSH-1738)
APS Equivalent	640mm	-
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades	9	9
35mm Equivalent	-	600mm
Diameter (mm)	163	129