Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Samyang AF 75mm F1.8 FE 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 FE also has a larger diameter of 65mm compared to Sigma 90mm F2.8 DG DN C's 64mm diameter.
Below you can find the scaled side by side image of Sigma 90mm F2.8 DG DN C and Samyang AF 75mm F1.8 FE to get a better idea of how their size compare in real life.
Comparison image of Sigma 90mm F2.8 DG DN C and Samyang AF 75mm F1.8 FE Size and Weight 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. Samyang AF 75mm F1.8 FE weighs 230g, 28% (65g) lighter than the Sigma 90mm F2.8 DG DN C's weight of 295g.
Lens Mounts
Both Sigma 90mm F2.8 DG DN C and Samyang AF 75mm F1.8 FE 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, Sony A6600 and Sony A6100.
Sigma 90mm F2.8 DG DN C is also available in Leica L mount.
Focal Range
Sigma 90mm F2.8 DG DN C is a prime lens with fixed focal lenght of 90mm which has a 35mm equivalent focal range of 135mm when used on a 35mm FF format camera. Samyang AF 75mm F1.8 FE 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 an 35mm (FF) equivalent of 112.5mm.