The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 24-70mm F2.8 GM II and the Samyang 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. Sony FE 24-70mm F2.8 GM II is the longer of the two lenses at 120mm. The Samyang 8mm F3.5 Fisheye with a length of 77mm, is 43mm shorter. Besides being longer, the Sony FE 24-70mm F2.8 GM II also has a larger diameter of 88mm compared to the Samyang 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. Samyang 8mm F3.5 Fisheye weighs 443g, 36% (252g) lighter than the Sony FE 24-70mm F2.8 GM II's weight of 695g.
Lens Mounts
The Sony FE 24-70mm F2.8 GM II has the Sony E lens mount whereas the Samyang 8mm F3.5 Fisheye has the Sony Alpha 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 Sony A68, Sony A77 II and Sony A58 for the Sony Alpha Mount.
Samyang 8mm F3.5 Fisheye is also available in Canon EF , Nikon F (DX), Four Thirds, Pentax KAF and Samsung NX mounts.
Focal Range
Sony FE 24-70mm F2.8 GM II 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 Samyang 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.
