The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 20mm F2 DG DN C and the Sony 20mm F2.8 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 Sony 20mm F2.8 with a length of 54mm, is 18mm shorter. On the other hand, the Sony 20mm F2.8 has a larger diameter of 78mm compared to the Sigma 20mm F2 DG DN C's 70mm 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 20mm F2.8 weighs 285g, 22% (85g) lighter than the Sigma 20mm F2 DG DN C's weight of 370g.
Filter Threads
The Sigma 20mm F2 DG DN C has a filter size of 62mm whereas the Sony 20mm F2.8 has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Sigma 20mm F2 DG DN C:
And these are the 72mm filters that we recommend for the Sony 20mm F2.8:
Lens Mounts
The Sigma 20mm F2 DG DN C has the Sony E lens mount whereas the Sony 20mm F2.8 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.
Sigma 20mm F2 DG DN C is also available in the Leica L mount.
Focal Range
Both lenses have the same focal range of
20mm but while Sigma 20mm F2 DG DN C has the fastest aperture of
F2.0, the Sony 20mm F2.8's widest aperture value is
F2.8.
