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 Canon 100-400mm f4.5-5.6L IS USM 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. Canon 100-400mm f4.5-5.6L IS USM is the longer of the two lenses at 189mm. The Samyang 300mm f6.3 with a length of 74mm, is 115mm shorter. Besides being longer, the Canon 100-400mm f4.5-5.6L IS USM also has a larger diameter of 92mm 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 260g, which means it is 1120g (81%) lighter than the Canon 100-400mm f4.5-5.6L IS USM which has a weight of 1380g.
Filter Threads
The Samyang 300mm f6.3 has a filter size of 26mm whereas the Canon 100-400mm f4.5-5.6L IS USM has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 26mm filters that we recommend you to consider for the Samyang 300mm f6.3:
And these are the 77mm filters that we recommend for the Canon 100-400mm f4.5-5.6L IS USM:
Lens Mounts
Both the Samyang 300mm f6.3 and the Canon 100-400mm f4.5-5.6L IS USM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon T8i, Canon 90D and Canon SL3.
Samyang 300mm f6.3 is also available in the Nikon F (DX) , Four Thirds and Sony Alpha 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
480mm when used on a APS-C / DX format camera.
On the other hand, the Canon 100-400mm f4.5-5.6L IS USM has a focal range of 100-400mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 160 - 640mm.
