The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 11-20mm F2.8 Di III-A and the 7artisans 12mm F2.8 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. Tamron 11-20mm F2.8 Di III-A is the longer of the two lenses at 86mm. The 7artisans 12mm F2.8 with a length of 66mm, is 20mm shorter. Besides being longer, the Tamron 11-20mm F2.8 Di III-A also has a larger diameter of 73mm compared to the 7artisans 12mm F2.8's 63mm diameter.
Below you can find a scaled side-by-side image of Tamron 11-20mm F2.8 Di III-A and 7artisans 12mm F2.8 to get a better idea of how their sizes compare in real life.
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. 7artisans 12mm F2.8 weighs 295g, 11% (40g) lighter than the Tamron 11-20mm F2.8 Di III-A's weight of 335g.
The Tamron 11-20mm F2.8 Di III-A has a filter size of 67mm whereas the 7artisans 12mm F2.8 has a 46mm 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 11-20mm F2.8 Di III-A:
And these are the 46mm filters that we recommend for the 7artisans 12mm F2.8:
Both the Tamron 11-20mm F2.8 Di III-A and the 7artisans 12mm F2.8 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A6700, Sony FX30 and Sony ZV-E10.
Tamron 11-20mm F2.8 Di III-A is also available in Fujifilm X mount.
7artisans 12mm F2.8 is also available in Canon EF-M and Fujifilm X mounts.
Tamron 11-20mm F2.8 Di III-A has a focal range of 11-20mm and 1.8X
zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 16.5-30mm
when used on a APS-C / DX format camera.
On the other hand, the 7artisans 12mm F2.8 is a prime lens with fixed focal lenght of 12mm which has an effective (full-frame 35mm equivalent) focal range of 18mm when used on a APS-C / DX format camera.