The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Yongnuo 50mm F1.8S II and the Sigma 45mm F2.8 DG DN 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. Yongnuo 50mm F1.8S II is the longer of the two lenses at 58mm. The Sigma 45mm F2.8 DG DN C with a length of 46mm, is 12mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 64mm.
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. Yongnuo 50mm F1.8S II weighs 134g, which means it is 81g (37%) lighter than the Sigma 45mm F2.8 DG DN C which has a weight of 215g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Sony E Mount for size comparison purposes.
Standard Lenses in Sony E Mount for Size Comparison
Filter Threads
The Yongnuo 50mm F1.8S II has a filter size of 49mm whereas the Sigma 45mm F2.8 DG DN 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 49mm filters that we recommend you to consider for the Yongnuo 50mm F1.8S II:
And these are the 55mm filters that we recommend for the Sigma 45mm F2.8 DG DN C:
Lens Mounts
Both the Yongnuo 50mm F1.8S II and the Sigma 45mm F2.8 DG DN C has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony ZV-E10 II, Sony A6700 and Sony FX30.
Sigma 45mm F2.8 DG DN C is also available in Leica L mount.
Focal Range
Yongnuo 50mm F1.8S II is a prime lens with fixed focal lenght of 50mm which has an effective (full-frame 35mm equivalent) focal range of
75mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 45mm F2.8 DG DN C is a prime lens with fixed focal lenght of 45mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 67.5mm.
