The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 20-40mm F2.8 VXD and the Sony FE 20mm F1.8 G for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Tamron 20-40mm F2.8 VXD is the longer of the two lenses at 86mm. The Sony FE 20mm F1.8 G with a length of 85mm, is 1mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 74mm.
Below you can find a scaled side-by-side image of Tamron 20-40mm F2.8 VXD and Sony FE 20mm F1.8 G to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 20-40mm F2.8 VXD and the Sony FE 20mm F1.8 G Size and Weight The 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 20-40mm F2.8 VXD weighs 365g, which means it is 8g (2%) lighter than the Sony FE 20mm F1.8 G which has a weight of 373g.
Lens Mounts
Both the Tamron 20-40mm F2.8 VXD and the Sony FE 20mm F1.8 G has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony ZV-E1, Sony A7R V and Sony FX30.
Focal Range
Tamron 20-40mm F2.8 VXD has a focal range of 20-40mm and 2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 30 - 60mm.
Sony FE 20mm F1.8 G 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.