Comparison of Nikon 400mm f/2.8E FL ED AF-S VR Nikkor and Tamron SP AF 300mm f/2.8 LD IF

Attribute	Nikon 400mm f/2.8E FL ED AF-S VR Nikkor ×	Tamron SP AF 300mm f/2.8 LD IF ×
Notes	Electromagnetic Diaphragm; Image Stabilization	Available AF Mounts: Canon, Minolta, Nikon; Included Accessories: Lens Hood, Case
Magnification Ratio (x)	0.16	0.141
Filter Size (mm)	5	43
Length (mm)	358	215.9
Closest Focus (m)	2.6	2.5
Diagonal Angle of View (degree)	6.20	8.00
Focus Details	Internal; Silent Wave Motor; A/M/MA/MA switch	Internal; Focus ring slides back and forth to switch between AF and MF
Focal Length (mm)	400.00	300.00
APS Equivalent	600mm	1.5x: 450mm; 1.6x: 480mm
Brand	Nikon	Tamron
Image Circle	35mm	35mm
Name	Nikon 400mm f/2.8E FL ED AF-S VR Nikkor	Tamron SP AF 300mm f/2.8 LD IF
Weight (g)	3800	2800
Type	Telephoto Prime	Telephoto Prime
Aperture (f)	2.80 - 22.00	2.80 - 32.00
Diaphragm Blades	9	9
Diaphragm Blades Type	rounded	-
Lens Construction	16 elements in 12 groups, including 2 ED glass and 2 Fluorite elements, with Nano Crystal Coat	10 elements in 7 groups, including 2 LD elements
Zoom System	n/a	-
Diameter (mm)	159.5	120