Comparison of Olympus 12-60mm ƒ/2.8-4 SWD Zuiko Digital ED and Sigma 17-50mm ƒ/2.8 EX DC OS HSM

Attribute	Olympus 12-60mm ƒ/2.8-4 SWD Zuiko Digital ED ×	Sigma 17-50mm ƒ/2.8 EX DC OS HSM ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades Type	circular	rounded
Filter Size (mm)	72	77
Notes	Dust and drip proof. Includes Lens Hood (LH-75B) and Lens Case (LC-72B)	Image Stabilized (except for Pentax and Sony mounts). Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony. Included Accessories: Case, Petal-type
Focus Details	-	Internal, with Hyper-Sonic Motor; AF/MF switch
Type	Standard Zoom	Standard Zoom
Diaphragm Blades	7	7
Diameter (mm)	79.5	83.5
Image Circle	Image Circle	APS-C
Focal Length (mm)	12.00 - 60.00	17.00 - 50.00
Brand	Olympus	Sigma
Name	Olympus 12-60mm ƒ/2.8-4 SWD Zuiko Digital ED	Sigma 17-50mm ƒ/2.8 EX DC OS HSM
Weight (g)	575	565
Diagonal Angle of View (degree)	20.00 - 84.00	27.90 - 72.40
Lens Construction	14 elements in 10 groups, including 1 Super ED, 2 ED, 1 Aspherical ED and 2 Aspherical elements	17 elements in 13 groups, including 2 FLD glass elements
Zoom System	Rotary	Rotary with lock
Closest Focus (m)	0.25	0.28
35mm Equivalent	24 - 120mm	-
Length (mm)	98.5	91.8
APS Equivalent	-	1.5x: 26 - 75mm; 1.6x: 27 - 80mm
Magnification Ratio (x)	0.28	0.2