The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 50-400mm F4.5-6.3 VC and the Samyang 300mm f6.3 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. Tamron 50-400mm F4.5-6.3 VC is the longer of the two lenses at 183mm. The Samyang 300mm f6.3 with a length of 74mm, is 109mm shorter. Besides being longer, the Tamron 50-400mm F4.5-6.3 VC also has a larger diameter of 89mm 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, 72% (837g) lighter than the Tamron 50-400mm F4.5-6.3 VC's weight of 1155g.
Lens Mounts
Both the Tamron 50-400mm F4.5-6.3 VC and the Samyang 300mm f6.3 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5, Sony A7R VI and Sony A7 V.
Tamron 50-400mm F4.5-6.3 VC is also available in the Nikon Z mount.
Samyang 300mm f6.3 is also available in Canon EF-M , Fujifilm X and Micro Four Thirds mounts.
Focal Range
Tamron 50-400mm F4.5-6.3 VC has a focal range of 50-400mm and
8.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
75 - 600mm.
On the other hand, the 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.
