The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 35mm F1.4 GM and the Tamron 20mm F2.8 Di III OSD M1:2 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. Sony FE 35mm F1.4 GM is the longer of the two lenses at 96mm. The Tamron 20mm F2.8 Di III OSD M1:2 with a length of 64mm, is 32mm shorter. Besides being longer, the Sony FE 35mm F1.4 GM also has a larger diameter of 76mm compared to the Tamron 20mm F2.8 Di III OSD M1:2's 73mm 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, 58% (304g) lighter than the Sony FE 35mm F1.4 GM's weight of 524g.
Filter Threads
Both the Sony FE 35mm F1.4 GM and the Tamron 20mm F2.8 Di III OSD M1:2 have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sony FE 35mm F1.4 GM and the Tamron 20mm F2.8 Di III OSD M1:2 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.
Focal Range
Sony FE 35mm F1.4 GM is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
52.5mm.
On the other hand, the Tamron 20mm F2.8 Di III OSD M1:2 is a prime lens with fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 30mm.