Comparison of Nikon 24-85mm f/2.8-4D IF AF Nikkor and Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM Contemporary

Attribute	Nikon 24-85mm f/2.8-4D IF AF Nikkor ×	Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM Contemporary ×
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Filter Size (mm)	72	72
Notes	Included Accessories: HB-25 Hood	Image Stabilized (up to 4 stops); Available AF Mounts: Canon, Nikon, Sigma, Pentax, Sony; Accessory: lens hood LH780-03.
Closest Focus (m)	0.21	0.22
Magnification Ratio (x)	0.5	0.34
Diameter (mm)	79	79
Type	Standard Zoom	Standard Zoom
APS Equivalent	36 - 127mm	1.5x: 25.5 - 105mm; 1.6x: 27.2 - 112mm
Diaphragm Blades	9	7
Image Circle	35mm	APS-C
Focal Length (mm)	24.00 - 85.00	17.00 - 70.00
Brand	Nikon	Sigma
Name	Nikon 24-85mm f/2.8-4D IF AF Nikkor	Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM Contemporary
Weight (g)	544	470
Diagonal Angle of View (degree)	28.50 - 84.50	22.90 - 79.70
Lens Construction	15 elements in 11 groups, including 2 aspherical elements	16 elements in 14 groups, including FLD, SLD, and 3 aspherical elements
Zoom System	Rotary	Rotary with lock
Length (mm)	81	82
Diaphragm Blades Type	-	rounded
Focus Details	Internal	Internal, with Hyper-Sonic Motor; AF/MF switch