Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sony 12-24mm F2.8 GM is the longer of the two lenses at 137mm. The Tamron 11-20mm F2.8 Di III-A with a length of 86mm is 51mm shorter. Besides being longer, the Sony 12-24mm F2.8 GM also has a larger diameter of 98mm compared to Tamron 11-20mm F2.8 Di III-A's 73mm diameter.
Below you can find the scaled side by side image of Tamron 11-20mm F2.8 Di III-A and Sony 12-24mm F2.8 GM to get a better idea of how their size compare in real life.
Comparison image of Tamron 11-20mm F2.8 Di III-A and Sony 12-24mm F2.8 GM Size and Weight Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Tamron 11-20mm F2.8 Di III-A weighs 335g, which means it is 512g (152%) lighter than the Sony 12-24mm F2.8 GM which has a weight of 847g.
Below you can find the dimension and weight table of the 'Wideangle Zoom Lenses in Sony E Mount for size comparison purposes.
Wideangle Zoom Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both Tamron 11-20mm F2.8 Di III-A and Sony 12-24mm F2.8 GM has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A7 IV, Sony ZV-E10 and Sony A1.
Focal Range
Tamron 11-20mm F2.8 Di III-A has a focal range of 11-20mm and 1.8X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 16.5 - 30mm.
Sony 12-24mm F2.8 GM has a focal range of 12-24mm and 2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 18 - 36mm.