The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 20mm F2.8 Di III OSD M1:2 and the Tokina Firin 20mm F2 FE MF 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. Tokina Firin 20mm F2 FE MF is the longer of the two lenses at 82mm. The Tamron 20mm F2.8 Di III OSD M1:2 with a length of 64mm, is 18mm shorter. On the other hand, the Tamron 20mm F2.8 Di III OSD M1:2 has a larger diameter of 73mm compared to the Tokina Firin 20mm F2 FE MF'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. Tamron 20mm F2.8 Di III OSD M1:2 weighs 220g, which means it is 270g (55%) lighter than the Tokina Firin 20mm F2 FE MF which has a weight of 490g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Ultra-Wideangle Lenses in Sony E Mount for Size Comparison
Filter Threads
The Tamron 20mm F2.8 Di III OSD M1:2 has a filter size of 67mm whereas the Tokina Firin 20mm F2 FE MF has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Tamron 20mm F2.8 Di III OSD M1:2:
And these are the 62mm filters that we recommend for the Tokina Firin 20mm F2 FE MF:
Lens Mounts
Both the Tamron 20mm F2.8 Di III OSD M1:2 and the Tokina Firin 20mm F2 FE MF has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
Tokina Firin 20mm F2 FE MF is also available in Sony E mount.
Focal Range
Both lenses have the same focal range of
20mm but while Tamron 20mm F2.8 Di III OSD M1:2 has the fastest aperture of
F2.8, the Tokina Firin 20mm F2 FE MF's widest aperture value is
F2.