The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon EF 600mm F4L IS III USM 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. Canon EF 600mm F4L IS III USM is the longer of the two lenses at 448mm. The Samyang 300mm f6.3 with a length of 74mm, is 374mm shorter. Besides being longer, the Canon EF 600mm F4L IS III USM also has a larger diameter of 168mm 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, 91% (2790g) lighter than the Canon EF 600mm F4L IS III USM's weight of 3050g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Canon EF Mount for size comparison purposes.
Super Telephoto Lenses in Canon EF Mount for Size Comparison
Filter Threads
The Canon EF 600mm F4L IS III USM has a filter size of 52mm whereas the Samyang 300mm f6.3 has a 26mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Canon EF 600mm F4L IS III USM:
And these are the 26mm filters that we recommend for the Samyang 300mm f6.3:
Lens Mounts
Both the Canon EF 600mm F4L IS III USM and the Samyang 300mm f6.3 has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K.
Samyang 300mm f6.3 is also available in Nikon F (DX) , Four Thirds and Sony Alpha mounts.
Focal Range
Canon EF 600mm F4L IS III USM is a prime lens with fixed focal lenght of 600mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
960mm.
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 480mm when used on a APS-C / DX format camera.
