Comparison of Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary and Tamron 100-400mm f/4.5-6.3 Di VC USD (Model A035)

Attribute	Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary ×	Tamron 100-400mm f/4.5-6.3 Di VC USD (Model A035) ×
Aperture (f)	5.00 - 22.00	4.50 - 45.00
Filter Size (mm)	67	67
Notes	Available AF Mounts: Sigma SA, Canon EF, Nikon F; Image Stabilized; Mount with dust- and splash-proof design; Compatible with Mount Converter MC-11	Available mounts: Canon EF, Nikon F; Optical Image Stabiliztion (CIPA: 4 stops); Moisture-Resistant Construction
Closest Focus (m)	1.6	1.5
Magnification Ratio (x)	0.26	0.28
Diameter (mm)	86.4	86.2
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	1.5x: 150 - 600mm; 1.6x: 160 - 640mm	1.5x: 150 - 600mm; 1.6x: 160 - 640mm
Diaphragm Blades	9	9
Image Circle	35mm	Image Circle
Focal Length (mm)	100.00 - 400.00	100.00 - 400.00
Brand	Sigma	Tamron
Name	Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary	Tamron 100-400mm f/4.5-6.3 Di VC USD (Model A035)
Weight (g)	1160	1135
Diaphragm Blades Type	rounded	circular
Lens Construction	21 elements in 15 groups, including 4 SLD elements	17 elements in 11 groups, including 3 LD (Low Dispersion) elements; eBAND coating; Fluorine coating
Zoom System	Push/Pull	Rotary
Length (mm)	182.3	199
Diagonal Angle of View (degree)	-	6.20 - 24.40
Focus Details	Internal; HSM with full-time manual override	Internal; USD (Ultrasonic Silent Drive) motor