Comparison of Sigma 24-70mm f/2.8 DG OS HSM Art and Sony 24-70mm f/2.8 ZA SSM II Zeiss Vario-Sonnar T* SAL2470Z2

Attribute	Sigma 24-70mm f/2.8 DG OS HSM Art ×	Sony 24-70mm f/2.8 ZA SSM II Zeiss Vario-Sonnar T* SAL2470Z2 ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	82	77
Notes	Available AF Mounts: Sigma SA, Canon EF, Nikon F; Image Stabilized; Mount with dust- and splash-proof design; Compatible with Mount Converter MC-11	For Sony A-Mount; Dust- and moisture-resistant; Included Accessories: ALC-SH101 petal lens hood
Closest Focus (m)	0.37	0.34
Magnification Ratio (x)	0.21	0.25
Zoom System	Rotary	Rotary
Type	Standard Zoom	Standard Zoom
APS Equivalent	1.5x: 36 - 105mm; 1.6x: 38.4 - 112mm	36 - 105mm
Diaphragm Blades	9	9
Image Circle	35mm	35mm
Focal Length (mm)	24.00 - 70.00	24.00 - 70.00
Brand	Sigma	Sony
Name	Sigma 24-70mm f/2.8 DG OS HSM Art	Sony 24-70mm f/2.8 ZA SSM II Zeiss Vario-Sonnar T* SAL2470Z2
Weight (g)	1020	974
Diaphragm Blades Type	rounded	rounded
Lens Construction	19 elements in 14 groups, including 4 aspherical and 3 SLD elements	17 elements in 13 groups, including 2 aspheric and 2 extra-low dispersion elements; T* coating
Diagonal Angle of View (degree)	34.30 - 84.10	34.00 - 84.00
Length (mm)	107.6	111
Diameter (mm)	88	83
Focus Details	Internal focus; HSM with full-time manual override	Internal; Super Sonic wave Motor (SSM) with AF/MF switch and focus hold; ~4x the subject tracking speed of the previous model