The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tokina 50-135mm f2.8 DX and the Sigma 50-150mm F2.8 EX DC OS HSM for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sigma 50-150mm F2.8 EX DC OS HSM is the longer of the two lenses at 198mm. The Tokina 50-135mm f2.8 DX with a length of 135mm, is 63mm shorter. Besides being longer, the Sigma 50-150mm F2.8 EX DC OS HSM also has a larger diameter of 86mm compared to the Tokina 50-135mm f2.8 DX's 78mm diameter.
The 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. Tokina 50-135mm f2.8 DX weighs 845g, which means it is 505g (37%) lighter than the Sigma 50-150mm F2.8 EX DC OS HSM which has a weight of 1350g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Nikon F (DX) Mount for size comparison purposes.
Telephoto Zoom Lenses in Nikon F (DX) Mount for Size Comparison
Lens Mounts
Both the Tokina 50-135mm f2.8 DX and the Sigma 50-150mm F2.8 EX DC OS HSM has the same Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (DX) lenses are Nikon D3500, Nikon D7500 and Nikon D5600.
Tokina 50-135mm f2.8 DX is also available in Canon EF mount.
Sigma 50-150mm F2.8 EX DC OS HSM is also available in Canon EF and Sigma SA mounts.
Focal Range
Tokina 50-135mm f2.8 DX has a focal range of 50-135mm and 2.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 75-202.5mm when used on a APS-C / DX format camera. Sigma 50-150mm F2.8 EX DC OS HSM has a focal range of 50-150mm and 3.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 75-225mm when used on a APS-C / DX format camera.