Comparison of Sigma 18-125mm f/3.5-5.6 DC and Sigma 28-105mm f/2.8-4 DG

Attribute	Sigma 28-105mm f/2.8-4 DG ×	Sigma 18-125mm f/3.5-5.6 DC ×
Filter Size (mm)	72	62
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax, Four-Thirds
Closest Focus (m)	0.5	0.5
Magnification Ratio (x)	0.18	0.19
Type	Standard Zoom	Standard Zoom
Length (mm)	81	70
APS Equivalent	1.5x: 42 - 157.5mm; 1.6x: 44.8 - 168mm	1.5x: 27 - 187.5mm; 1.6x: 28.8 - 200mm
Zoom System	Rotary	Rotary
Image Circle	35mm	Image Circle
Focal Length (mm)	28.00 - 105.00	18.00 - 125.00
Brand	Sigma	Sigma
Name	Sigma 28-105mm f/2.8-4 DG	Sigma 18-125mm f/3.5-5.6 DC
Weight (g)	405	385
Aperture (f)	2.80 - 22.00	3.50 - 22.00
Diaphragm Blades	8	7
Diagonal Angle of View (degree)	23.30 - 75.40	11.40 - 69.30
Lens Construction	12 elements in 11 groups, including 1 aspherical element	15 elements in 14 groups, including two aspherical elements and one Special Low Dispersion (SLD) lens
Diameter (mm)	77	77.7
Focus Details	Internal focusing	Inner focusing system