The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Nikon Z 18-140mm f3.5-6.3 VR and the Sigma 18-200mm f3.5-6.3 II DC OS HSM 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. Nikon Z 18-140mm f3.5-6.3 VR is the longer of the two lenses at 90mm. The Sigma 18-200mm f3.5-6.3 II DC OS HSM with a length of 88mm, is 2mm shorter. On the other hand, the Sigma 18-200mm f3.5-6.3 II DC OS HSM has a larger diameter of 75mm compared to the Nikon Z 18-140mm f3.5-6.3 VR's 73mm 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. Nikon Z 18-140mm f3.5-6.3 VR weighs 315g, which means it is 175g (35%) lighter than the Sigma 18-200mm f3.5-6.3 II DC OS HSM which has a weight of 490g.
Filter Threads
Both the Nikon Z 18-140mm f3.5-6.3 VR and the Sigma 18-200mm f3.5-6.3 II DC OS HSM have the same Filter thread size of 62mm.
Below are links to the 62mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Nikon Z 18-140mm f3.5-6.3 VR has the Nikon Z lens mount whereas the Sigma 18-200mm f3.5-6.3 II DC OS HSM has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are RED Komodo-X 6K Z, Nikon Z50 II and Nikon Z30 for the Nikon Z Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Sigma 18-200mm f3.5-6.3 II DC OS HSM is also available in Canon EF and Sigma SA mounts.
Focal Range
Nikon Z 18-140mm f3.5-6.3 VR has a focal range of 18-140mm and
7.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-210mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 18-200mm f3.5-6.3 II DC OS HSM has a focal range of 18-200mm and 11.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-300mm when used on a APS-C / DX format camera.
