Comparison of Canon EF 400mm f/5.6L USM and Tamron 70-210mm f/4 Di VC USD (Model A034)

Attribute	Canon EF 400mm f/5.6L USM ×	Tamron 70-210mm f/4 Di VC USD (Model A034) ×
Aperture (f)	5.60 - 32.00	4.00 - 32.00
Filter Size (mm)	77	67
Notes	Built-in hood; detachable tripod mount	Moisture-Resistant Construction; Image Stabilized (CIPA rated to 4-stops); Available mounts: Canon EF, Nikon F
Closest Focus (m)	3.5	0.95
Magnification Ratio (x)	0.12	0.32
Diaphragm Blades Type	-	rounded
Type	Telephoto Prime	Telephoto Zoom
APS Equivalent	640mm	1.5x: 105 - 315mm; 1.6x: 112 - 336mm
Diaphragm Blades	8	9
Image Circle	35mm	35mm
Focal Length (mm)	400.00	70.00 - 210.00
Brand	Canon	Tamron
Name	Canon EF 400mm f/5.6L USM	Tamron 70-210mm f/4 Di VC USD (Model A034)
Weight (g)	1250	859
Diagonal Angle of View (degree)	6.20	11.80 - 34.30
Lens Construction	7 elements in 6 groups, including 1 UD and 1 S-UD element	20 elements in 14 groups, including 3 LD (Low Dispersion) elements; Fluorine Coating
Diameter (mm)	90	76
Length (mm)	256	175
Zoom System	-	Rotary
Focus Details	Inner focusing; full-time manual focus and USM	Internal using USD (Ultrasonic Silent Drive) motor with continuous manual focus override; AF/MF switch