Comparison of Olympus 7-14mm ƒ/2.8 Pro M.Zuiko Digital ED and Sigma 15-30mm f/3.5-4.5 EX DG Aspherical

Attribute	Sigma 15-30mm f/3.5-4.5 EX DG Aspherical ×	Olympus 7-14mm ƒ/2.8 Pro M.Zuiko Digital ED ×
Zoom System	Rotary	Rotary
Diaphragm Blades Type	-	circular
Diagonal Angle of View (degree)	71.60 - 110.50	75.00 - 114.00
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Weather sealed; Fixed lens hood and pinch-style lens cap LC-79 included.
Aperture (f)	3.50 - 22.00	2.80 - 22.00
APS Equivalent	1.5x: 22.5 - 45mm; 1.6x: 24 - 48mm	-
Type	Wide Zoom	Wide Zoom
Diaphragm Blades	8	7
Lens Construction	17 elements in 13 groups, including 2 aspherical elements	14 elements in 11 groups, including 2 aspherical ED, 1 double-sided aspherical, 1 aspherical, 3 Super ED , 1 ED and 2 HR elements
Image Circle	35mm	Image Circle
Focal Length (mm)	15.00 - 30.00	7.00 - 14.00
Brand	Sigma	Olympus
Name	Sigma 15-30mm f/3.5-4.5 EX DG Aspherical	Olympus 7-14mm ƒ/2.8 Pro M.Zuiko Digital ED
Weight (g)	615	534
Diameter (mm)	87	78.9
Length (mm)	132.5	105.8
35mm Equivalent	-	14 - 28mm
Magnification Ratio (x)	0.17	0.11
Focus Details	Internal Focus with Dual Focus mechanism	-
Closest Focus (m)	0.3	0.2