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 Voigtlander 21mm F4 Color Skopar II 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 Voigtlander 21mm F4 Color Skopar II 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 Voigtlander 21mm F4 Color Skopar II's 55mm 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. Voigtlander 21mm F4 Color Skopar II weighs 136g, 63% (234g) 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 Voigtlander 21mm F4 Color Skopar II has a 39mm 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 39mm filters that we recommend for the Voigtlander 21mm F4 Color Skopar II:
Lens Mounts
The Sigma 20mm F2 DG DN C has the Sony E lens mount whereas the Voigtlander 21mm F4 Color Skopar II has the Leica M 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 Leica M EV1, Leica M11-D and Pixii Max for the Leica M Mount.
Sigma 20mm F2 DG DN C is also available in the Leica L mount.
Focal Range
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.
On the other hand, the Voigtlander 21mm F4 Color Skopar II is a prime lens with fixed focal lenght of 21mm.
