The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang AF 75mm F1.8 X and the Sigma 56mm F1.4 C 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. Samyang AF 75mm F1.8 X is the longer of the two lenses at 69mm. The Sigma 56mm F1.4 C with a length of 60mm, is 9mm shorter. Besides being longer, the Samyang AF 75mm F1.8 X also has a larger diameter of 70mm compared to the Sigma 56mm F1.4 C's 67mm 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. Samyang AF 75mm F1.8 X weighs 257g, which means it is 23g (8%) lighter than the Sigma 56mm F1.4 C which has a weight of 280g.
Below you can find the dimension and weight table of the TelephotoPrime Lenses in Fujifilm X Mount for size comparison purposes.
Standard Lenses in Fujifilm X Mount for Size Comparison
Filter Threads
The Samyang AF 75mm F1.8 X has a filter size of 62mm whereas the Sigma 56mm F1.4 C has a 55mm 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 Samyang AF 75mm F1.8 X:
And these are the 55mm filters that we recommend for the Sigma 56mm F1.4 C:
Lens Mounts
Both the Samyang AF 75mm F1.8 X and the Sigma 56mm F1.4 C has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5.
Sigma 56mm F1.4 C is also available in Nikon Z and Canon RF mounts.
Focal Range
Samyang AF 75mm F1.8 X is a prime lens with fixed focal lenght of 75mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
112.5mm.
On the other hand, the Sigma 56mm F1.4 C 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 / DX format camera.
