Comparison of Sigma 18-35mm ƒ/1.8 DC HSM Art and Sony 16-35mm f/2.8 ZA SSM II Zeiss Vario-Sonnar T* SAL1635Z2

Attribute	Sony 16-35mm f/2.8 ZA SSM II Zeiss Vario-Sonnar T* SAL1635Z2 ×	Sigma 18-35mm ƒ/1.8 DC HSM Art ×
Aperture (f)	2.80 - 22.00	1.80 - 16.00
Filter Size (mm)	77	72
Notes	For Sony A-Mount; Dust- and moisture-resistant; Included Accessories: ALC-SH106 lens hood	Available AF Mounts: Canon EF, Nikon F, Sigma SA, Pentax K and Sony A; Included Accessories: lens hood, caps.
Closest Focus (m)	0.28	0.28
Magnification Ratio (x)	0.24	0.23
Zoom System	Rotary	Rotary with lock
Type	Wide Zoom	Wide Zoom
APS Equivalent	24 - 52.5mm	1.5x: 27 - 52.5mm; 1.6x: 28.8 - 56mm
Diaphragm Blades	9	9
Image Circle	35mm	APS-C
Focal Length (mm)	16.00 - 35.00	18.00 - 35.00
Brand	Sony	Sigma
Name	Sony 16-35mm f/2.8 ZA SSM II Zeiss Vario-Sonnar T* SAL1635Z2	Sigma 18-35mm ƒ/1.8 DC HSM Art
Weight (g)	872	811
Diaphragm Blades Type	circular	rounded
Lens Construction	17 elements in 13 groups, including 1 ED, 1 Super ED and 3 aspherical elements; T* coating	17 elements in 12 groups, including SLD and aspherical elements
Diagonal Angle of View (degree)	63.00 - 107.00	44.20 - 76.50
Length (mm)	114	122
Diameter (mm)	83	79
Focus Details	Internal; SSM (Super Sonic wave Motor) with Focus Hold button and Auto Clutch; ~4x the subject tracking speed of the previous model	Internal, with Hyper-Sonic Motor; AF/MF switch