Comparison of Canon EF-S 18-135mm f/3.5-5.6 IS USM 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 f/3.5-5.6 IS USM ×
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Compatible with PZ-E Power Zoom Adapter; Image Stabilization up to 4-stops; EW-73D lens hood included.
Magnification Ratio (x)	0.22	0.21
Filter Size (mm)	77	67
Length (mm)	90.9	96
Closest Focus (m)	0.5	0.39
Diagonal Angle of View (degree)	18.20 - 84.10	11.30 - 74.20
Focus Details	Internal	Inner focusing; Nano USM AF with full-time manual focus
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 f/3.5-5.6 IS USM
Weight (g)	530	515
Type	Standard Zoom	Standard Zoom
Aperture (f)	2.80 - 32.00	3.50 - 36.00
Diaphragm Blades	9	7
Diaphragm Blades Type	-	rounded
Lens Construction	16 elements in 15 groups, including 2 aspherical and 1 SLD elements	16 elements in 12 groups
Zoom System	Rotary	Rotary
Diameter (mm)	83.6	77.4