Comparison of Nikon 28-105mm f/3.5-4.5D AF Nikkor and Sigma 28-105mm f/2.8-4 Aspherical IF

Attribute	Nikon 28-105mm f/3.5-4.5D AF Nikkor ×	Sigma 28-105mm f/2.8-4 Aspherical IF ×
Aperture (f)	3.50 - 22.00	2.80 - 22.00
Magnification Ratio (x)	0.5	0.18
Filter Size (mm)	62	62
Front Element Rotation	-	-
Closest Focus (m)	0.22	0.5
Diameter (mm)	71	77
Type	Standard Zoom	Standard Zoom
APS Equivalent	42 - 158mm	1.5x: 42 - 157.5mm; 1.6x: 44.8 - 168mm
Diaphragm Blades	9	8
Image Circle	35mm	35mm
Focal Length (mm)	28.00 - 105.00	28.00 - 105.00
Brand	Nikon	Sigma
Name	Nikon 28-105mm f/3.5-4.5D AF Nikkor	Sigma 28-105mm f/2.8-4 Aspherical IF
Weight (g)	454	405
Diagonal Angle of View (degree)	23.30 - 74.30	23.30 - 75.40
Lens Construction	16 elements in 13 groups, including 1 aspheric element	12 elements in 11 groups, including 1 aspherical element
Zoom System	Rotary	Rotary
Length (mm)	81	79.5
Notes	-	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax
Focus Details	Internal	Internal