Comparison of Canon EF 28-135mm f/3.5-5.6 IS USM and Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro

Attribute	Canon EF 28-135mm f/3.5-5.6 IS USM ×	Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro ×
Magnification Ratio (x)	0.19	0.3
Filter Size (mm)	72	72
Focus Details	Inner focusing; full-time manual focus and USM	-
Closest Focus (m)	0.5	0.4
Lens Construction	16 elements in 12 groups, including 1 aspherical element	14 elements in 10 groups
Length (mm)	97	80.6
Focal Length (mm)	28.00 - 135.00	24.00 - 135.00
Diagonal Angle of View (degree)	18.00 - 75.00	18.00 - 84.00
Brand	Canon	Tamron
Image Circle	35mm	35mm
Name	Canon EF 28-135mm f/3.5-5.6 IS USM	Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro
Weight (g)	540	530
Type	Standard Zoom	Standard Zoom
Notes	Image Stabilization	Available AF Mounts: Canon, Minolta, Nikon, Pentax; Included Accessories: Lens Hood
APS Equivalent	45 - 216mm	1.5x: 36 - 202.5mm; 1.6x: 38.4 - 216mm
Aperture (f)	3.50 - 36.00	3.50 - 22.00
Diaphragm Blades	6	7
Zoom System	Rotary	Rotary
Diameter (mm)	78	78.5