The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang AF 45mm F1.8 FE 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. Samyang AF 45mm F1.8 FE is the longer of the two lenses at 56mm. The Sigma 45mm F2.8 DG DN C with a length of 46mm, is 10mm shorter. On the other hand, the Sigma 45mm F2.8 DG DN C has a larger diameter of 64mm compared to the Samyang AF 45mm F1.8 FE's 62mm 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 45mm F1.8 FE weighs 162g, which means it is 53g (24%) lighter than the Sigma 45mm F2.8 DG DN C which has a weight of 215g.
Filter Threads
The Samyang AF 45mm F1.8 FE 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 Samyang AF 45mm F1.8 FE:
And these are the 55mm filters that we recommend for the Sigma 45mm F2.8 DG DN C:
Lens Mounts
The Samyang AF 45mm F1.8 FE has the Sony E lens mount whereas the Sigma 45mm F2.8 DG DN C has the Leica L lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount.
Sigma 45mm F2.8 DG DN C is also available in Sony E mount.
Focal Range
Both lenses have the same focal range of
45mm but while Samyang AF 45mm F1.8 FE has the fastest aperture of
F1.8, the Sigma 45mm F2.8 DG DN C's widest aperture value is
F2.8.
