The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 50mm F1.8 and the Sigma 30mm F1.4 C 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 30mm F1.4 C is the longer of the two lenses at 73mm. The Sony FE 50mm F1.8 with a length of 60mm, is 13mm shorter. On the other hand, the Sony FE 50mm F1.8 has a larger diameter of 69mm compared to the Sigma 30mm F1.4 C's 65mm diameter.
Below you can find a scaled side-by-side image of Sony FE 50mm F1.8 and Sigma 30mm F1.4 C 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. Sony FE 50mm F1.8 weighs 186g, which means it is 79g (29%) lighter than the Sigma 30mm F1.4 C which has a weight of 265g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Sony E Mount for size comparison purposes.
Standard Prime Lenses in Sony E Mount for Size Comparison
Both the Sony FE 50mm F1.8 and the Sigma 30mm F1.4 C has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A7R V, Sony FX30 and Sony A7 IV.
Sigma 30mm F1.4 C is also available in Micro Four Thirds and Fujifilm X mounts.
Sony FE 50mm F1.8 is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 75mm.
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.