Comparison of Canon EF 28-105mm f/3.5-4.5 II USM and Sigma 18-125mm f/3.5-5.6 DC

Attribute	Sigma 18-125mm f/3.5-5.6 DC ×	Canon EF 28-105mm f/3.5-4.5 II USM ×
Filter Size (mm)	62	58
Aperture (f)	3.50 - 22.00	3.50 - 27.00
Closest Focus (m)	0.5	0.5
Magnification Ratio (x)	0.19	0.19
Type	Standard Zoom	Standard Zoom
Focus Details	Inner focusing system	Inner focusing; full-time manual focus and USM
APS Equivalent	1.5x: 27 - 187.5mm; 1.6x: 28.8 - 200mm	45 - 168mm
Diameter (mm)	77.7	72
Image Circle	Image Circle	35mm
Focal Length (mm)	18.00 - 125.00	28.00 - 105.00
Brand	Sigma	Canon
Name	Sigma 18-125mm f/3.5-5.6 DC	Canon EF 28-105mm f/3.5-4.5 II USM
Weight (g)	385	375
Diagonal Angle of View (degree)	11.40 - 69.30	23.50 - 75.00
Diaphragm Blades	7	7
Zoom System	Rotary	Rotary
Length (mm)	70	75
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax, Four-Thirds	-
Lens Construction	15 elements in 14 groups, including two aspherical elements and one Special Low Dispersion (SLD) lens	15 elements in 12 groups