The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF-S 7.8mm F4 STM Dual and the Samyang MF 14mm F2.8 RF 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. Samyang MF 14mm F2.8 RF is the longer of the two lenses at 120mm. The Canon RF-S 7.8mm F4 STM Dual with a length of 42mm, is 78mm shorter. Besides being longer, the Samyang MF 14mm F2.8 RF also has a larger diameter of 87mm compared to the Canon RF-S 7.8mm F4 STM Dual's 69mm 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. Canon RF-S 7.8mm F4 STM Dual weighs 131g, which means it is 679g (83%) lighter than the Samyang MF 14mm F2.8 RF which has a weight of 810g.
Below you can find the dimension and weight table of the Dual Wideangle Prime Lenses in Canon RF Mount for size comparison purposes.
Ultra-Wideangle Lenses in Canon RF Mount for Size Comparison
Lens Mounts
Both the Canon RF-S 7.8mm F4 STM Dual and the Samyang MF 14mm F2.8 RF has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R50 V, Canon R100 and Canon R50.
Focal Range
Canon RF-S 7.8mm F4 STM Dual is a prime lens with fixed focal lenght of 7.8mm which has an effective (full-frame 35mm equivalent) focal range of
12.8mm when used on a APS-C / DX format camera.
On the other hand, the Samyang MF 14mm F2.8 RF is a prime lens with fixed focal lenght of 14mm.
