Comparison of Olympus 12-60mm ƒ/2.8-4 SWD Zuiko Digital ED and Sigma 24-70mm f/2.8 EX DG Macro

Attribute	Sigma 24-70mm f/2.8 EX DG Macro ×	Olympus 12-60mm ƒ/2.8-4 SWD Zuiko Digital ED ×
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades Type	-	circular
Filter Size (mm)	82	72
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Dust and drip proof. Includes Lens Hood (LH-75B) and Lens Case (LC-72B)
Focus Details	Internal with Dual Focus mechanism	-
Type	Standard Zoom	Standard Zoom
Diaphragm Blades	9	7
Diameter (mm)	88.6	79.5
Image Circle	35mm	Image Circle
Focal Length (mm)	24.00 - 70.00	12.00 - 60.00
Brand	Sigma	Olympus
Name	Sigma 24-70mm f/2.8 EX DG Macro	Olympus 12-60mm ƒ/2.8-4 SWD Zuiko Digital ED
Weight (g)	715	575
Diagonal Angle of View (degree)	34.30 - 84.10	20.00 - 84.00
Lens Construction	14 elements in 13 groups, including 3 aspherical and 2 SLD elements	14 elements in 10 groups, including 1 Super ED, 2 ED, 1 Aspherical ED and 2 Aspherical elements
Zoom System	Rotary	Rotary
Closest Focus (m)	0.4	0.25
35mm Equivalent	-	24 - 120mm
Length (mm)	115.5	98.5
APS Equivalent	1.5x: 36 - 105mm; 1.6x: 38.4 - 112mm	-
Magnification Ratio (x)	0.26	0.28