The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 40mm F2 SL II and the Rokinon 35mm f1.4 for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Rokinon 35mm f1.4 is the longer of the two lenses at 112mm. The Voigtlander 40mm F2 SL II with a length of 25mm is 87mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 63mm.
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. Voigtlander 40mm F2 SL II weighs 200g, which means it is 460g (69%) lighter than the Rokinon 35mm f1.4 which has a weight of 660g.
Lens Mounts
Both Voigtlander 40mm F2 SL II and Rokinon 35mm f1.4 has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Voigtlander 40mm F2 SL II is also available in Canon EF and Pentax KAF mounts.
Rokinon 35mm f1.4 is also available in Canon EF , Four Thirds, Pentax KAF, Sony Alpha and Samsung NX mounts.
Focal Range
Voigtlander 40mm F2 SL II is a prime lens with fixed focal lenght of 40mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 60mm.
Rokinon 35mm f1.4 is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 52.5mm.