The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24-70 F2.8 DG DN Art and the Rokinon 8mm f3.5 Fisheye 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. Sigma 24-70 F2.8 DG DN Art is the longer of the two lenses at 123mm. The Rokinon 8mm f3.5 Fisheye with a length of 77mm, is 46mm shorter. Besides being longer, the Sigma 24-70 F2.8 DG DN Art also has a larger diameter of 88mm compared to the Rokinon 8mm f3.5 Fisheye's 75mm diameter.
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. Rokinon 8mm f3.5 Fisheye weighs 443g, 46% (392g) lighter than the Sigma 24-70 F2.8 DG DN Art's weight of 835g.
Lens Mounts
The Sigma 24-70 F2.8 DG DN Art has the Sony E lens mount whereas the Rokinon 8mm f3.5 Fisheye has the Samsung NX lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Samsung NX1, Samsung NX3000 and Samsung NX30 for the Samsung NX Mount.
Sigma 24-70 F2.8 DG DN Art is also available in the Leica L mount.
Rokinon 8mm f3.5 Fisheye is also available in Canon EF , Nikon F (FX), Four Thirds, Pentax KAF and Sony Alpha mounts.
Focal Range
Sigma 24-70 F2.8 DG DN Art has a focal range of 24-70mm and
2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
36 - 105mm.
On the other hand, the Rokinon 8mm f3.5 Fisheye is a prime lens with fixed focal lenght of 8mm which has an effective (full-frame 35mm equivalent) focal range of 12mm when used on a APS-C / DX format camera.
