The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 50mm F1.4 GM and the Tamron 45mm F1.8 Di VC USD 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 50mm F1.4 GM is the longer of the two lenses at 96mm. The Tamron 45mm F1.8 Di VC USD with a length of 92mm, is 4mm shorter. Besides being longer, the Sony FE 50mm F1.4 GM also has a larger diameter of 81mm compared to the Tamron 45mm F1.8 Di VC USD's 80mm 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. Sony FE 50mm F1.4 GM weighs 516g, which means it is 4g (0%) lighter than the Tamron 45mm F1.8 Di VC USD which has a weight of 520g.
Filter Threads
Both the Sony FE 50mm F1.4 GM and the Tamron 45mm F1.8 Di VC USD 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
The Sony FE 50mm F1.4 GM has the Sony E lens mount whereas the Tamron 45mm F1.8 Di VC USD has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Tamron 45mm F1.8 Di VC USD is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Sony FE 50mm F1.4 GM is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
75mm.
On the other hand, the Tamron 45mm F1.8 Di VC USD is a prime lens with fixed focal lenght of 45mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 67.5mm.
