The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang Premium MF 14mm F2.4 and the Sigma 15mm F2.8 EX DG Fisheye for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Samyang Premium MF 14mm F2.4 is the longer of the two lenses at 109mm. The Sigma 15mm F2.8 EX DG Fisheye with a length of 65mm is 44mm shorter. Besides being longer, the Samyang Premium MF 14mm F2.4 also has a larger diameter of 95mm compared to Sigma 15mm F2.8 EX DG Fisheye's 74mm diameter.
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. Sigma 15mm F2.8 EX DG Fisheye weighs 370g, 53% (421g) lighter than the Samyang Premium MF 14mm F2.4's weight of 791g.
Lens Mounts
Both Samyang Premium MF 14mm F2.4 and Sigma 15mm F2.8 EX DG Fisheye 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.
Sigma 15mm F2.8 EX DG Fisheye is also available in Nikon F (FX) , Pentax KAF, Sony Alpha and Sigma SA mounts.
Focal Range
Samyang Premium MF 14mm F2.4 is a prime lens with fixed focal lenght of 14mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 22.4mm.
Sigma 15mm F2.8 EX DG Fisheye is a prime lens with fixed focal lenght of 15mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 24mm.