Comparison of Canon EF-S 18-135mm ƒ/3.5-5.6 IS and Sigma 24-135mm f/2.8-4.5 Aspherical IF

Attribute	Sigma 24-135mm f/2.8-4.5 Aspherical IF ×	Canon EF-S 18-135mm ƒ/3.5-5.6 IS ×
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	EF-S lens mount, exclusively for bodies with APS-C sensors. Image Stabilization up to 4-stops. Optional lens hood.
Magnification Ratio (x)	0.22	0.21
Filter Size (mm)	77	67
Length (mm)	90.9	101
Closest Focus (m)	0.5	0.45
Diagonal Angle of View (degree)	18.20 - 84.10	11.50 - 74.30
Focus Details	Internal	Inner focusing; AF/MF switch with micro DC motor
Focal Length (mm)	24.00 - 135.00	18.00 - 135.00
APS Equivalent	1.5x: 36 - 202.5mm; 1.6x: 38.4 - 216mm	29 - 216mm
Brand	Sigma	Canon
Image Circle	35mm	APS-C
Name	Sigma 24-135mm f/2.8-4.5 Aspherical IF	Canon EF-S 18-135mm ƒ/3.5-5.6 IS
Weight (g)	530	455
Type	Standard Zoom	Standard Zoom
Aperture (f)	2.80 - 32.00	3.50 - 38.00
Diaphragm Blades	9	6
Diaphragm Blades Type	-	rounded
Lens Construction	16 elements in 15 groups, including 2 aspherical and 1 SLD elements	16 elements in 12 groups, including UD and aspherical elements
Zoom System	Rotary	Rotary
Diameter (mm)	83.6	75