Comparison of Nikon 400mm f/2.8D ED-IF II AF-S Nikkor and Tamron SP AF 300mm f/2.8 LD IF

Attribute	Nikon 400mm f/2.8D ED-IF II AF-S Nikkor ×	Tamron SP AF 300mm f/2.8 LD IF ×
Magnification Ratio (x)	0.13	0.141
Filter Size (mm)	52	43
Focus Details	Internal; Silent Wave motor; M/A switch	Internal; Focus ring slides back and forth to switch between AF and MF
Closest Focus (m)	3.5	2.5
Lens Construction	11 Elements in 9 groups, including 3 ED elements	10 elements in 7 groups, including 2 LD elements
Length (mm)	353	215.9
Focal Length (mm)	400.00	300.00
Diagonal Angle of View (degree)	6.20	8.00
Brand	Nikon	Tamron
Image Circle	35mm	35mm
Name	Nikon 400mm f/2.8D ED-IF II AF-S Nikkor	Tamron SP AF 300mm f/2.8 LD IF
Weight (g)	4400	2800
Type	Telephoto Prime	Telephoto Prime
Notes	Included Accessories: CT-402 Trunk Case, HK-27 Hood, LN-1 Strap, 52mm Filter Holder, Gel Filter Holder	Available AF Mounts: Canon, Minolta, Nikon; Included Accessories: Lens Hood, Case
APS Equivalent	600mm	1.5x: 450mm; 1.6x: 480mm
Aperture (f)	2.80 - 22.00	2.80 - 32.00
Diaphragm Blades	9	9
Zoom System	n/a	-
Diameter (mm)	160	120