Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Nikon 200-400mm f4G ED-IF VR is the longer of the two lenses at 358mm. The Tamron 200-500mm f5-6.3 LD with a length of 227mm is 131mm shorter. Besides being longer, the Nikon 200-400mm f4G ED-IF VR also has a larger diameter of 124mm compared to Tamron 200-500mm f5-6.3 LD's 94mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Tamron 200-500mm f5-6.3 LD weighs 1237g, which means it is 2038g (164%) lighter than the Nikon 200-400mm f4G ED-IF VR which has a weight of 3275g.
Below you can find the dimension and weight table of the 'Telephoto Zoom Lenses in Nikon F (FX) Mount for size comparison purposes.
Telephoto Zoom Lenses in Nikon F (FX) Mount for Size Comparison
Lens Mounts
Both Tamron 200-500mm f5-6.3 LD and Nikon 200-400mm f4G ED-IF VR has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Tamron 200-500mm f5-6.3 LD is also available in Canon EF and Sony Alpha mounts.
Focal Range
Tamron 200-500mm f5-6.3 LD has a focal range of 200-500mm and 2.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 300 - 750mm.
Nikon 200-400mm f4G ED-IF VR has a focal range of 200-400mm and 2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 300 - 600mm.