Comparison of Nikon 17-55mm f/2.8G ED-IF AF-S DX Nikkor and Sigma 18-35mm ƒ/1.8 DC HSM Art

Attribute	Sigma 18-35mm ƒ/1.8 DC HSM Art ×	Nikon 17-55mm f/2.8G ED-IF AF-S DX Nikkor ×
Aperture (f)	1.80 - 16.00	2.80 - 22.00
Filter Size (mm)	72	77
Notes	Available AF Mounts: Canon EF, Nikon F, Sigma SA, Pentax K and Sony A; Included Accessories: lens hood, caps.	DX Nikkor for use with Nikon Digital SLR models only. Lens hood, case included.
Closest Focus (m)	0.28	0.36
Magnification Ratio (x)	0.23	0.2
Diameter (mm)	79	86
Type	Wide Zoom	Standard Zoom
APS Equivalent	1.5x: 27 - 52.5mm; 1.6x: 28.8 - 56mm	26 - 83mm
Diaphragm Blades	9	7
Image Circle	APS-C	APS-C
Focal Length (mm)	18.00 - 35.00	17.00 - 55.00
Brand	Sigma	Nikon
Name	Sigma 18-35mm ƒ/1.8 DC HSM Art	Nikon 17-55mm f/2.8G ED-IF AF-S DX Nikkor
Weight (g)	811	764
Diagonal Angle of View (degree)	44.20 - 76.50	28.80 - 79.80
Lens Construction	17 elements in 12 groups, including SLD and aspherical elements	14 elements in 10 groups, including 3 ED and 3 aspherical elements
Zoom System	Rotary with lock	Rotary
Length (mm)	122	112
Diaphragm Blades Type	rounded	-
Focus Details	Internal, with Hyper-Sonic Motor; AF/MF switch	Internal; AF-S "Silent Wave" motor