The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang T-S 24mm f3.5 and the Rokinon 24mm f1.4 for their suitability to various photography scenarios:
Size and Weight Comparison
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. Rokinon 24mm f1.4 weighs 580g, 14% (100g) lighter than the Samyang T-S 24mm f3.5's weight of 680g.
Lens Mounts
Both the Samyang T-S 24mm f3.5 and the Rokinon 24mm f1.4 has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Samyang T-S 24mm f3.5 is also available in Nikon F (FX) , Pentax KAF, Sony Alpha and Sony E mounts.
Rokinon 24mm f1.4 is also available in Nikon F (FX) , Four Thirds, Pentax KAF, Sony Alpha and Samsung NX mounts.
Focal Range
Both lenses have the same focal range of 24mm but while Samyang T-S 24mm f3.5 has the fastest aperture of F3.5, the Rokinon 24mm f1.4's widest aperture value is F1.4.