The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tokina 16-28mm f2.8 Pro FX and the Tokina 16-50mm f2.8 DX for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Tokina 16-28mm f2.8 Pro FX is the longer of the two lenses at 133mm. The Tokina 16-50mm f2.8 DX with a length of 97mm, is 36mm shorter. Besides being longer, the Tokina 16-28mm f2.8 Pro FX also has a larger diameter of 90mm compared to the Tokina 16-50mm f2.8 DX's 84mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Tokina 16-50mm f2.8 DX weighs 610g, 35% (340g) lighter than the Tokina 16-28mm f2.8 Pro FX's weight of 950g.
Lens Mounts
The Tokina 16-28mm f2.8 Pro FX has the Nikon F (FX) lens mount whereas the Tokina 16-50mm f2.8 DX has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount and Canon T8i, Canon 90D and Canon SL3 for the Canon EF Mount.
Tokina 16-28mm f2.8 Pro FX is also available in Canon EF mount.
Tokina 16-50mm f2.8 DX is also available in Nikon F (DX) mount.
Focal Range
Tokina 16-28mm f2.8 Pro FX has a focal range of 16-28mm and
1.8X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
24 - 42mm.
On the other hand, the Tokina 16-50mm f2.8 DX has a focal range of 16-50mm and 3.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 25.6-80mm when used on a APS-C / DX format camera.