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 90mm 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 75mm F1.8 X is the longer of the two lenses at 69mm. The Sigma 90mm F2.8 DG DN 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 90mm F2.8 DG DN C's 64mm diameter.
Samyang AF 75mm F1.8 X vs Sigma 90mm F2.8 DG DN C Lenses Size Comparison
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 38g (12%) lighter than the Sigma 90mm F2.8 DG DN C which has a weight of 295g.
Filter Threads
The Samyang AF 75mm F1.8 X has a filter size of 62mm whereas the Sigma 90mm 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 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 90mm F2.8 DG DN C:
Lens Mounts
The Samyang AF 75mm F1.8 X has the Fujifilm X lens mount whereas the Sigma 90mm F2.8 DG DN C has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount and Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount.
Sigma 90mm F2.8 DG DN C is also available in Leica L mount.
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 90mm F2.8 DG DN C is a prime lens with fixed focal lenght of 90mm.
