The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 16mm F1.4 DC DN X and the Fujifilm 18mm F2 R 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 16mm F1.4 DC DN X is the longer of the two lenses at 92mm. The Fujifilm 18mm F2 R with a length of 41mm, is 51mm shorter. Besides being longer, the Sigma 16mm F1.4 DC DN X also has a larger diameter of 72mm compared to the Fujifilm 18mm F2 R's 65mm diameter.
Below you can find a scaled side-by-side image of Sigma 16mm F1.4 DC DN X and Fujifilm 18mm F2 R to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 16mm F1.4 DC DN X and the Fujifilm 18mm F2 R Size and Weight 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. Fujifilm 18mm F2 R weighs 116g, 71% (289g) lighter than the Sigma 16mm F1.4 DC DN X's weight of 405g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Fujifilm X Mount for size comparison purposes.
Wideangle Prime Lenses in Fujifilm X Mount for Size Comparison
Lens Mounts
Both the Sigma 16mm F1.4 DC DN X and the Fujifilm 18mm F2 R has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T5, Fujifilm X-H2 and Fujifilm X-H2S.
Focal Range
Sigma 16mm F1.4 DC DN X is a prime lens with fixed focal lenght of 16mm which has an effective (full-frame 35mm equivalent) focal range of 24mm when used on a APS-C / DX format camera. Fujifilm 18mm F2 R is a prime lens with fixed focal lenght of 18mm which has an effective (full-frame 35mm equivalent) focal range of 27mm when used on a APS-C / DX format camera.