The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron AF 70-300mm f4-5.6 LD and the Sigma 70-300mm F4-5.6 DG for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 70-300mm F4-5.6 DG is the longer of the two lenses at 122mm. The Tamron AF 70-300mm f4-5.6 LD with a length of 117mm is 5mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 77mm.
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 AF 70-300mm f4-5.6 LD weighs 435g, which means it is 115g (20%) lighter than the Sigma 70-300mm F4-5.6 DG which has a weight of 550g.
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 AF 70-300mm f4-5.6 LD and Sigma 70-300mm F4-5.6 DG 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 AF 70-300mm f4-5.6 LD is also available in Canon EF , Sony Alpha and Pentax KAF mounts.
Sigma 70-300mm F4-5.6 DG is also available in Canon EF , Nikon F (FX), Pentax KAF, Sony Alpha, Sigma SA, Canon EF, Pentax KAF, Sony Alpha and Sigma SA mounts.
Focal Range
Both lenses have the same focal range of 70-300mm and the fastest aperture of F4.0 - F5.6.