Comparison of Canon EF 400mm ƒ/2.8L IS II USM and Olympus 90-250mm f/2.8 PRO ED Zuiko Digital

Attribute	Canon EF 400mm ƒ/2.8L IS II USM ×	Olympus 90-250mm f/2.8 PRO ED Zuiko Digital ×
Magnification Ratio (x)	0.17	0.08
Filter Size (mm)	52	105
Focus Details	Inner focusing; Ultra-sonic Motor (USM), AF/PF/MF switch, Focus Preset, Range Limiter	-
Closest Focus (m)	1.7	2.5
Zoom System	-	Rotary
Lens Construction	16 elements in 12 groups	17 elements in 12 groups, including 3 ED elements
Focal Length (mm)	400.00	90.00 - 250.00
Diaphragm Blades Type	rounded	-
Brand	Canon	Olympus
Image Circle	35mm	Image Circle
Name	Canon EF 400mm ƒ/2.8L IS II USM	Olympus 90-250mm f/2.8 PRO ED Zuiko Digital
Weight (g)	3900	3270
Type	Telephoto Prime	Telephoto Zoom
Notes	Image Stabilization (4-stops); Included Accessories: lens hood and hard case.	Includes Lens Hood (LH-120B) and Lens Case (LSH-1738)
APS Equivalent	640mm	-
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades	9	9
Diagonal Angle of View (degree)	6.20	5.00 - 14.00
Length (mm)	343	276
35mm Equivalent	-	180 - 500mm
Diameter (mm)	163	124