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 55-250mm f4-5.6 IS 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. Canon 55-250mm f4-5.6 IS II is the longer of the two lenses at 108mm. The Samyang 300mm f6.3 with a length of 74mm, is 34mm shorter. Besides being longer, the Canon 55-250mm f4-5.6 IS II also has a larger diameter of 70mm 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 130g (33%) lighter than the Canon 55-250mm f4-5.6 IS II which has a weight of 390g.
The Samyang 300mm f6.3 has a filter size of 26mm whereas the Canon 55-250mm f4-5.6 IS II has a 58mm 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 58mm filters that we recommend for the Canon 55-250mm f4-5.6 IS II:
The Samyang 300mm f6.3 has the Canon EF lens mount whereas the Canon 55-250mm f4-5.6 IS II has the Canon EF-S lens mount. Some of the latest released cameras that are compatible with these mounts are Canon T8i, Canon 90D and Canon SL3 for the Canon EF Mount and Canon T8i, Canon 90D and Canon SL3 for the Canon EF-S Mount.
Samyang 300mm f6.3 is also available in Nikon F (DX) , Four Thirds and Sony Alpha mounts.
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 55-250mm f4-5.6 IS II has a focal range of 55-250mm and 4.5X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 88-400mm when used on a APS-C / DX format camera.