The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 56mm F1.4 C and the Sigma 30mm 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. Sigma 30mm F1.4 C is the longer of the two lenses at 73mm. The Sigma 56mm F1.4 C with a length of 60mm, is 13mm shorter. On the other hand, the Sigma 56mm F1.4 C has a larger diameter of 67mm compared to the Sigma 30mm F1.4 C's 65mm 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 30mm F1.4 C weighs 265g, 5% (15g) lighter than the Sigma 56mm F1.4 C's weight of 280g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Fujifilm X Mount for size comparison purposes.
Standard Lenses in Fujifilm X Mount for Size Comparison
Filter Threads
The Sigma 56mm F1.4 C has a filter size of 55mm whereas the Sigma 30mm F1.4 C has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 55mm filters that we recommend you to consider for the Sigma 56mm F1.4 C:
And these are the 52mm filters that we recommend for the Sigma 30mm F1.4 C:
Lens Mounts
Both the Sigma 56mm F1.4 C and the Sigma 30mm 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-S20, Fujifilm X-T5 and Fujifilm X-H2.
Sigma 56mm F1.4 C is also available in Nikon Z mount.
Sigma 30mm F1.4 C is also available in Sony E , Micro Four Thirds and Nikon Z mounts.
Focal Range
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.
On the other hand, the Sigma 30mm F1.4 C is a prime lens with fixed focal lenght of 30mm which has an effective (full-frame 35mm equivalent) focal range of 45mm when used on a APS-C / DX format camera.