The type of photography that you are planning to use is an important decision factor. Here we have evaluated the TTArtisan 14mm F2.8 and the Canon RF-S 7.8mm F4 STM Dual 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. TTArtisan 14mm F2.8 is the longer of the two lenses at 75mm. The Canon RF-S 7.8mm F4 STM Dual with a length of 42mm, is 33mm shorter. On the other hand, the Canon RF-S 7.8mm F4 STM Dual has a larger diameter of 69mm compared to the TTArtisan 14mm F2.8'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. Canon RF-S 7.8mm F4 STM Dual weighs 131g, 70% (306g) lighter than the TTArtisan 14mm F2.8's weight of 437g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Canon RF Mount for size comparison purposes.
Ultra-Wideangle Lenses in Canon RF Mount for Size Comparison
Filter Threads
The TTArtisan 14mm F2.8 has a filter size of 77mm whereas the Canon RF-S 7.8mm F4 STM Dual 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 77mm filters that we recommend you to consider for the TTArtisan 14mm F2.8:
And these are the 58mm filters that we recommend for the Canon RF-S 7.8mm F4 STM Dual:
Lens Mounts
Both the TTArtisan 14mm F2.8 and the Canon RF-S 7.8mm F4 STM Dual has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R6 V, Canon R6 III and Canon C50.
TTArtisan 14mm F2.8 is also available in the Sony E , Nikon Z and Leica L mounts.
Focal Range
TTArtisan 14mm F2.8 is a prime lens with fixed focal lenght of 14mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
22.4mm.
On the other hand, the 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.
