Comparison of Nikon 24-85mm f/2.8-4D IF AF Nikkor and Sigma 28-70mm f/2.8 EX DG

Attribute	Nikon 24-85mm f/2.8-4D IF AF Nikkor ×	Sigma 28-70mm f/2.8 EX DG ×
Magnification Ratio (x)	0.5	0.23
Filter Size (mm)	72	67
Focus Details	Internal	-
Closest Focus (m)	0.21	0.33
Lens Construction	15 elements in 11 groups, including 2 aspherical elements	14 elements in 12 groups, including 4 aspherical and 2 SLD elements
Length (mm)	81	87.2
Focal Length (mm)	24.00 - 85.00	28.00 - 70.00
Diagonal Angle of View (degree)	28.50 - 84.50	34.30 - 75.40
Brand	Nikon	Sigma
Image Circle	35mm	35mm
Name	Nikon 24-85mm f/2.8-4D IF AF Nikkor	Sigma 28-70mm f/2.8 EX DG
Weight (g)	544	510
Type	Standard Zoom	Standard Zoom
Notes	Included Accessories: HB-25 Hood	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax
APS Equivalent	36 - 127mm	1.5x: 42 - 105mm; 1.6x: 44.8 - 112mm
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	9	9
Zoom System	Rotary	Rotary with lock
Diameter (mm)	79	74