Comparison of Nikon 28-105mm f/3.5-4.5D AF Nikkor and Sigma 24-135mm f/2.8-4.5 Aspherical IF

Attribute	Sigma 24-135mm f/2.8-4.5 Aspherical IF ×	Nikon 28-105mm f/3.5-4.5D AF Nikkor ×
Aperture (f)	2.80 - 32.00	3.50 - 22.00
Magnification Ratio (x)	0.22	0.5
Filter Size (mm)	77	62
Front Element Rotation	-	-
Closest Focus (m)	0.5	0.22
Diameter (mm)	83.6	71
Type	Standard Zoom	Standard Zoom
APS Equivalent	1.5x: 36 - 202.5mm; 1.6x: 38.4 - 216mm	42 - 158mm
Diaphragm Blades	9	9
Image Circle	35mm	35mm
Focal Length (mm)	24.00 - 135.00	28.00 - 105.00
Brand	Sigma	Nikon
Name	Sigma 24-135mm f/2.8-4.5 Aspherical IF	Nikon 28-105mm f/3.5-4.5D AF Nikkor
Weight (g)	530	454
Diagonal Angle of View (degree)	18.20 - 84.10	23.30 - 74.30
Lens Construction	16 elements in 15 groups, including 2 aspherical and 1 SLD elements	16 elements in 13 groups, including 1 aspheric element
Zoom System	Rotary	Rotary
Length (mm)	90.9	81
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	-
Focus Details	Internal	Internal