The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Venus Laowa 15mm f5 and the Sigma 20mm F2 DG DN C 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. Sigma 20mm F2 DG DN C is the longer of the two lenses at 72mm. The Venus Laowa 15mm f5 with a length of 25mm, is 47mm shorter. Besides being longer, the Sigma 20mm F2 DG DN C also has a larger diameter of 70mm compared to the Venus Laowa 15mm f5's 53mm 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. Venus Laowa 15mm f5 weighs 138g, which means it is 232g (62%) lighter than the Sigma 20mm F2 DG DN C which has a weight of 370g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Ultra-Wideangle Lenses in Sony E Mount for Size Comparison
Filter Threads
The Venus Laowa 15mm f5 has a filter size of 39mm whereas the Sigma 20mm F2 DG DN C has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 39mm filters that we recommend you to consider for the Venus Laowa 15mm f5:
And these are the 62mm filters that we recommend for the Sigma 20mm F2 DG DN C:
Lens Mounts
Both the Venus Laowa 15mm f5 and the Sigma 20mm F2 DG DN C has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5, Sony A7R VI and Sony A7 V.
Venus Laowa 15mm f5 is also available in the Nikon Z , Canon RF and Leica L mounts.
Sigma 20mm F2 DG DN C is also available in Leica L mount.
Focal Range
Venus Laowa 15mm f5 is a prime lens with fixed focal lenght of 15mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
22.5mm.
On the other hand, the Sigma 20mm F2 DG DN C 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.
