Comparison of Sigma 18-125mm f/3.8-5.6 DC OS HSM and Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro

Attribute	Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro ×	Sigma 18-125mm f/3.8-5.6 DC OS HSM ×
Magnification Ratio (x)	0.3	0.26
Filter Size (mm)	72	67
Focus Details	-	Internal, with HSM
Closest Focus (m)	0.4	0.35
Lens Construction	14 elements in 10 groups	16 elements in 12 groups, including SLD and aspherical elements
Length (mm)	80.6	88.5
Focal Length (mm)	24.00 - 135.00	18.00 - 125.00
Diagonal Angle of View (degree)	18.00 - 84.00	11.40 - 69.30
Brand	Tamron	Sigma
Image Circle	35mm	Image Circle
Name	Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro	Sigma 18-125mm f/3.8-5.6 DC OS HSM
Weight (g)	530	505
Type	Standard Zoom	Standard Zoom
Notes	Available AF Mounts: Canon, Minolta, Nikon, Pentax; Included Accessories: Lens Hood	Image Stabilization; Available AF mounts: Sigma, Canon, Nikon, Pentax, Sony
APS Equivalent	1.5x: 36 - 202.5mm; 1.6x: 38.4 - 216mm	1.5x: 27 - 188mm; 1.6x: 29 - 200mm
Aperture (f)	3.50 - 22.00	3.80 - 22.00
Diaphragm Blades	7	7
Zoom System	Rotary	Rotary
Diameter (mm)	78.5	74