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 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. Sigma 18-200mm F3.5-6.3 DC OS HSM is the longer of the two lenses at 98mm. The Nikon Z 18-140mm f3.5-6.3 VR with a length of 90mm, is 8mm shorter. Besides being longer, the Sigma 18-200mm F3.5-6.3 DC OS HSM also has a larger diameter of 79mm 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 285g (47%) lighter than the Sigma 18-200mm F3.5-6.3 DC OS HSM which has a weight of 600g.
Filter Threads
The Nikon Z 18-140mm f3.5-6.3 VR has a filter size of 62mm whereas the Sigma 18-200mm F3.5-6.3 DC OS HSM has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Nikon Z 18-140mm f3.5-6.3 VR:
And these are the 72mm filters that we recommend for the Sigma 18-200mm F3.5-6.3 DC OS HSM:
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 DC OS HSM has the Sigma SA 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 Sigma SD1 Merrill, Sigma SD1 and for the Sigma SA Mount.
Sigma 18-200mm F3.5-6.3 DC OS HSM is also available in Canon EF and Nikon F (DX) 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 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.
