The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Venus 105mm F2 and the Nikon 800mm f5.6E FL ED VR for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Nikon 800mm f5.6E FL ED VR is the longer of the two lenses at 461mm. The Venus 105mm F2 with a length of 99mm is 362mm shorter. Besides being longer, the Nikon 800mm f5.6E FL ED VR also has a larger diameter of 160mm compared to Venus 105mm F2's 76mm 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. Venus 105mm F2 weighs 745g, which means it is 3845g (83%) lighter than the Nikon 800mm f5.6E FL ED VR which has a weight of 4590g.
Below you can find the dimension and weight table of the 'Telephoto Prime Lenses in Nikon F (FX) Mount for size comparison purposes.
Telephoto Prime Lenses in Nikon F (FX) Mount for Size Comparison
Lens Mounts
Both Venus 105mm F2 and Nikon 800mm f5.6E FL ED 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.
Venus 105mm F2 is also available in Sony E , Canon EF, Pentax KAF2 and Sony Alpha mounts.
Focal Range
Venus 105mm F2 is a prime lens with fixed focal lenght of 105mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 157.5mm.
Nikon 800mm f5.6E FL ED VR is a prime lens with fixed focal lenght of 800mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 1200mm.