The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-50mm F2.8 DC DN C and the Fujifilm 56mm F1.2 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 18-50mm F2.8 DC DN C is the longer of the two lenses at 77mm. The Fujifilm 56mm F1.2 R with a length of 70mm, is 7mm shorter. On the other hand, the Fujifilm 56mm F1.2 R has a larger diameter of 73mm compared to the Sigma 18-50mm F2.8 DC DN C's 62mm diameter.
Below you can find a scaled side-by-side image of Sigma 18-50mm F2.8 DC DN C and Fujifilm 56mm F1.2 R to get a better idea of how their sizes compare in real life.
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. Sigma 18-50mm F2.8 DC DN C weighs 285g, which means it is 120g (29%) lighter than the Fujifilm 56mm F1.2 R which has a weight of 405g.
Both the Sigma 18-50mm F2.8 DC DN C and the Fujifilm 56mm F1.2 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.
Sigma 18-50mm F2.8 DC DN C is also available in Leica L and Sony E mounts.
Sigma 18-50mm F2.8 DC DN C has a focal range of 18-50mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-75mm when used on a APS-C / DX format camera. Fujifilm 56mm F1.2 R is a prime lens with fixed focal lenght of 56mm which has an effective (full-frame 35mm equivalent) focal range of 84mm when used on a APS-C format camera.