Comparison of Sigma APO 135-400mm f/4.5-5.6 DG and Tamron 100-400mm f/4.5-6.3 Di VC USD (Model A035)

Attribute	Sigma APO 135-400mm f/4.5-5.6 DG ×	Tamron 100-400mm f/4.5-6.3 Di VC USD (Model A035) ×
Aperture (f)	4.50 - 32.00	4.50 - 45.00
Filter Size (mm)	77	67
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax, Four-Thirds	Available mounts: Canon EF, Nikon F; Optical Image Stabiliztion (CIPA: 4 stops); Moisture-Resistant Construction
Closest Focus (m)	2	1.5
Magnification Ratio (x)	0.19	0.28
Diameter (mm)	88.5	86.2
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	1.5x: 202.5 - 600mm; 1.6x: 216 - 640mm	1.5x: 150 - 600mm; 1.6x: 160 - 640mm
Diaphragm Blades	9	9
Image Circle	35mm	Image Circle
Focal Length (mm)	135.00 - 400.00	100.00 - 400.00
Brand	Sigma	Tamron
Name	Sigma APO 135-400mm f/4.5-5.6 DG	Tamron 100-400mm f/4.5-6.3 Di VC USD (Model A035)
Weight (g)	1245	1135
Diagonal Angle of View (degree)	6.20 - 18.20	6.20 - 24.40
Lens Construction	13 elements in 11 groups, including 1 aspherical and 3 SLD elements	17 elements in 11 groups, including 3 LD (Low Dispersion) elements; eBAND coating; Fluorine coating
Zoom System	Rotary	Rotary
Length (mm)	183.5	199
Diaphragm Blades Type	-	circular
Focus Details	Internal	Internal; USD (Ultrasonic Silent Drive) motor