Comparison of Olympus 40-150mm ƒ/2.8 Pro M.Zuiko Digital ED and Sigma APO 50-150mm f/2.8 II EX DC HSM

Attribute	Olympus 40-150mm ƒ/2.8 Pro M.Zuiko Digital ED ×	Sigma APO 50-150mm f/2.8 II EX DC HSM ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades Type	rounded	-
Filter Size (mm)	72	67
Notes	Dust, splash and freezeproof construction; Function button, manual focus clutch	Available AF Mounts: Sigma, Canon, Nikon, Pentax, Sony; Included Accessories: Case, Lens Hood (LH850-01).
Focus Details	-	HSM (Hyper Sonic Motor) with full-time manual focus override
Type	Telephoto Zoom	Telephoto Zoom
Diaphragm Blades	9	9
Diameter (mm)	79.4	76.5
Image Circle	Image Circle	APS-C
Focal Length (mm)	40.00 - 150.00	50.00 - 150.00
Brand	Olympus	Sigma
Name	Olympus 40-150mm ƒ/2.8 Pro M.Zuiko Digital ED	Sigma APO 50-150mm f/2.8 II EX DC HSM
Weight (g)	760	780
Diagonal Angle of View (degree)	8.20 - 30.00	9.50 - 27.90
Lens Construction	16 elements in 10 groups, including 1 aspherical ED, 2 aspherical, 1 SED, 1 HD and 3 ED elements	18 elements in 14 groups, including 4 SLD elements
Zoom System	Rotary	Rotary
Closest Focus (m)	0.7	1
35mm Equivalent	80 - 300mm	-
Length (mm)	160	140.2
APS Equivalent	-	1.5x: 75 - 225mm; 1.6x: 80 - 240mm
Magnification Ratio (x)	0.21	0.19