The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 300mm f6.3 and the Sony 70-400mm F4-5.6 G SSM II 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 70-400mm F4-5.6 G SSM II is the longer of the two lenses at 196mm. The Samyang 300mm f6.3 with a length of 74mm, is 122mm shorter. Besides being longer, the Sony 70-400mm F4-5.6 G SSM II also has a larger diameter of 95mm compared to the Samyang 300mm f6.3's 65mm 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 300mm f6.3 weighs 318g, which means it is 1182g (78%) lighter than the Sony 70-400mm F4-5.6 G SSM II which has a weight of 1500g.
Lens Mounts
The Samyang 300mm f6.3 has the Sony E lens mount whereas the Sony 70-400mm F4-5.6 G SSM II has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount and Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Samyang 300mm f6.3 is also available in the Canon EF-M , Fujifilm X and Micro Four Thirds mounts.
Focal Range
Samyang 300mm f6.3 is a prime lens with fixed focal lenght of 300mm which has an effective (full-frame 35mm equivalent) focal range of
450mm when used on a APS-C / DX format camera.
On the other hand, the Sony 70-400mm F4-5.6 G SSM II has a focal range of 70-400mm and 5.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105 - 600mm.
