The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 40mm F2.5 G and the Sony E 50mm F1.8 OSS 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 E 50mm F1.8 OSS is the longer of the two lenses at 62mm. The Sony FE 40mm F2.5 G with a length of 45mm, is 17mm shorter. On the other hand, the Sony FE 40mm F2.5 G has a larger diameter of 68mm compared to the Sony E 50mm F1.8 OSS's 62mm diameter.
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Below you can find a scaled side-by-side image of Sony FE 40mm F2.5 G and Sony E 50mm F1.8 OSS 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. Sony FE 40mm F2.5 G weighs 173g, which means it is 29g (14%) lighter than the Sony E 50mm F1.8 OSS which has a weight of 202g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Sony E Mount for size comparison purposes.
Standard Lenses in Sony E Mount for Size Comparison
Filter Threads
Both the Sony FE 40mm F2.5 G and the Sony E 50mm F1.8 OSS have the same Filter thread size of 49mm.
Below are links to the 49mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sony FE 40mm F2.5 G and the Sony E 50mm F1.8 OSS 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 40mm F2.5 G is a prime lens with fixed focal lenght of 40mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
60mm.
On the other hand, the Sony E 50mm F1.8 OSS is a prime lens with fixed focal lenght of 50mm which has an effective (full-frame 35mm equivalent) focal range of 75mm when used on a APS-C / DX format camera.