The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Venus Laowa 4mm F2.8 E 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 a crucial factor to consider when comparing two lenses. Sony FE 20mm F1.8 G is the longer of the two lenses at 85mm. The Venus Laowa 4mm F2.8 E with a length of 26mm, is 59mm shorter. Besides being longer, the Sony FE 20mm F1.8 G also has a larger diameter of 74mm compared to the Venus Laowa 4mm F2.8 E's 61mm diameter.
Below you can find a scaled side-by-side image of Venus Laowa 4mm F2.8 E and Sony FE 20mm F1.8 G to get a better idea of how their sizes compare in real life.
Comparison image of the Venus Laowa 4mm F2.8 E and the Sony FE 20mm F1.8 G Size and Weight 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. Venus Laowa 4mm F2.8 E weighs 135g, which means it is 238g (63%) lighter than the Sony FE 20mm F1.8 G which has a weight of 373g.
Below you can find the dimension and weight table of the Wideangle Fisheye Prime Lenses in Sony E Mount for size comparison purposes.
Ultra-Wideangle Sony E Mount
Lens Mounts
Both the Venus Laowa 4mm F2.8 E 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-E10 II , Sony A6700 and Sony FX30 .
Focal Range
Venus Laowa 4mm F2.8 E is a prime lens with fixed focal lenght of 4mm which has an effective (full-frame 35mm equivalent) focal range of
6mm when used on a APS-C / DX format camera.
On the other hand, the 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 .
