Comparison of Sigma 28-70mm f/2.8 DG DN Contemporary and Sony 24-70mm ƒ/4 ZA OSS Carl Zeiss Vario-Tessar T* SEL2470Z

Attribute	Sigma 28-70mm f/2.8 DG DN Contemporary ×	Sony 24-70mm ƒ/4 ZA OSS Carl Zeiss Vario-Tessar T* SEL2470Z ×
Aperture (f)	2.80 - 22.00	4.00 - 22.00
Filter Size (mm)	67	67
Notes	Available AF Mounts: L-Mount, E-Mount; Dust- and splash-proof at lens mount	Optical SteadyShot; Included Accessories: ALC-SH130 Petal Lens Hood, Lens Case
Closest Focus (m)	0.19	0.4
Magnification Ratio (x)	4.6	0.2
Zoom System	Rotary	Rotary
Type	Standard Zoom	Standard Zoom
APS Equivalent	42 - 105mm	36 - 105mm
Diaphragm Blades	9	7
Image Circle	35mm	35mm (Full-frame E-Mount)
Focal Length (mm)	28.00 - 70.00	24.00 - 70.00
Brand	Sigma	Sony
Name	Sigma 28-70mm f/2.8 DG DN Contemporary	Sony 24-70mm ƒ/4 ZA OSS Carl Zeiss Vario-Tessar T* SEL2470Z
Weight (g)	470	426
Diaphragm Blades Type	rounded	rounded
Lens Construction	16 elements in 12 groups, including 2 FLD, 2 SLD and 3 aspherical elements; Super Multi-Layer Coating, Nano Porous Coating.	12 elements in 10 groups, including 5 aspheric and 1 extra-low dispersion element
Diagonal Angle of View (degree)	34.30 - 75.40	34.00 - 84.00
Length (mm)	101.5	94.5
Diameter (mm)	72.2	73
Focus Details	Internal focus with stepping motor; AF/MF switch; Supports DMF, AF+MF on Sony cameras	Linear motor