Comparison of Sigma 24-135mm f/2.8-4.5 Aspherical IF and Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro

Attribute	Sigma 24-135mm f/2.8-4.5 Aspherical IF ×	Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro ×
Magnification Ratio (x)	0.22	0.3
Filter Size (mm)	77	72
Focus Details	Internal	-
Closest Focus (m)	0.5	0.4
Lens Construction	16 elements in 15 groups, including 2 aspherical and 1 SLD elements	14 elements in 10 groups
Length (mm)	90.9	80.6
Focal Length (mm)	24.00 - 135.00	24.00 - 135.00
Diagonal Angle of View (degree)	18.20 - 84.10	18.00 - 84.00
Brand	Sigma	Tamron
Image Circle	35mm	35mm
Name	Sigma 24-135mm f/2.8-4.5 Aspherical IF	Tamron SP AF 24-135mm f/3.5-5.6 AD Aspherical IF Macro
Weight (g)	530	530
Type	Standard Zoom	Standard Zoom
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Available AF Mounts: Canon, Minolta, Nikon, Pentax; Included Accessories: Lens Hood
APS Equivalent	1.5x: 36 - 202.5mm; 1.6x: 38.4 - 216mm	1.5x: 36 - 202.5mm; 1.6x: 38.4 - 216mm
Aperture (f)	2.80 - 32.00	3.50 - 22.00
Diaphragm Blades	9	7
Zoom System	Rotary	Rotary
Diameter (mm)	83.6	78.5