The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Nikon 18-200mm f3.5-5.6G IF-ED 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 18-200mm f3.5-5.6G IF-ED VR is the longer of the two lenses at 97mm. The Sigma 18-200mm f3.5-6.3 II DC OS HSM with a length of 88mm, is 9mm shorter. Besides being longer, the Nikon 18-200mm f3.5-5.6G IF-ED VR also has a larger diameter of 77mm compared to the Sigma 18-200mm f3.5-6.3 II DC OS HSM's 75mm 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. Sigma 18-200mm f3.5-6.3 II DC OS HSM weighs 490g, 12% (70g) lighter than the Nikon 18-200mm f3.5-5.6G IF-ED VR's weight of 560g.
Below you can find the dimension and weight table of the SuperZoom Lenses in Nikon F (DX) Mount for size comparison purposes.
Superzoom Lenses in Nikon F (DX) Mount for Size Comparison
Filter Threads
The Nikon 18-200mm f3.5-5.6G IF-ED VR has a filter size of 72mm whereas the Sigma 18-200mm f3.5-6.3 II DC OS HSM has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Nikon 18-200mm f3.5-5.6G IF-ED VR:
And these are the 62mm filters that we recommend for the Sigma 18-200mm f3.5-6.3 II DC OS HSM:
Lens Mounts
Both the Nikon 18-200mm f3.5-5.6G IF-ED VR and the Sigma 18-200mm f3.5-6.3 II 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.
Sigma 18-200mm f3.5-6.3 II DC OS HSM is also available in Canon EF and Sigma SA mounts.
Focal Range
Both lenses have the same focal range of
18-200mm but while Nikon 18-200mm f3.5-5.6G IF-ED VR has the fastest aperture of
F3.5 - F5.6, the Sigma 18-200mm f3.5-6.3 II DC OS HSM's widest aperture value is
F3.5 - F6.3.