Comparison of Sigma 28-70mm f/2.8 EX DG and Sony 28-75mm f/2.8 SAM SAL-2875

Attribute	Sony 28-75mm f/2.8 SAM SAL-2875 ×	Sigma 28-70mm f/2.8 EX DG ×
Diagonal Angle of View (degree)	34.00 - 75.00	34.30 - 75.40
Notes	Zoom Lock Switch. Included Accessories: ALC-SH109 Petal Lens Hood	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Magnification Ratio (x)	0.22	0.23
Filter Size (mm)	67	67
Focus Details	Smooth Autofocus Motor (SAM) with AF/MF switch	-
Type	Standard Zoom	Standard Zoom
APS Equivalent	42 - 112.5mm	1.5x: 42 - 105mm; 1.6x: 44.8 - 112mm
Diaphragm Blades	7	9
Image Circle	35mm	35mm
Focal Length (mm)	28.00 - 75.00	28.00 - 70.00
Brand	Sony	Sigma
Name	Sony 28-75mm f/2.8 SAM SAL-2875	Sigma 28-70mm f/2.8 EX DG
Weight (g)	565	510
Zoom System	Rotary	Rotary with lock
Lens Construction	16 elements in 14 groups, including 4 aspheric and 3 ED elements	14 elements in 12 groups, including 4 aspherical and 2 SLD elements
Diameter (mm)	77.5	74
Length (mm)	94	87.2
Diaphragm Blades Type	rounded	-
Closest Focus (m)	0.38	0.33