Comparison of Nikon 16-35mm ƒ/4G ED VR II AF-S Nikkor and Sigma 20-40mm f/2.8 EX DG Aspherical

Attribute	Nikon 16-35mm ƒ/4G ED VR II AF-S Nikkor ×	Sigma 20-40mm f/2.8 EX DG Aspherical ×
Notes	VR II Image Stabilization (up to 4-stop correction). HB-23 Lens Hood and CL-1120 Flexible Lens Pouch Included.	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax
Magnification Ratio (x)	0.25	0.22
Filter Size (mm)	77	82
Length (mm)	125	107.8
Closest Focus (m)	0.27	0.27
Diagonal Angle of View (degree)	63.00 - 107.00	56.80 - 94.50
Focus Details	AF-S Silent Wave Motor AF; Internal Focusing with MA/M Switch	Internal with Dual Focus mechanism
Focal Length (mm)	16.00 - 35.00	20.00 - 40.00
APS Equivalent	24 - 53mm	1.5x: 30 - 60mm; 1.6x: 32 - 64mm
Brand	Nikon	Sigma
Image Circle	35mm	35mm
Name	Nikon 16-35mm ƒ/4G ED VR II AF-S Nikkor	Sigma 20-40mm f/2.8 EX DG Aspherical
Weight (g)	680	595
Type	Wide Zoom	Wide Zoom
Aperture (f)	4.00 - 22.00	2.80 - 22.00
Diaphragm Blades	9	8
Diaphragm Blades Type	rounded	-
Lens Construction	17 elements in 12 groups, with 2 ED and 3 Aspherical elements, Nano Crystal Coat	17 elements in 13 groups, including 2 aspherical elements
Zoom System	Rotary	Rotary
Diameter (mm)	82.5	89