Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Sigma 17mm F4 DG DN C is the longer of the two lenses at 49mm. The Voigtlander 21mm F4 Color Skopar II with a length of 25mm, is 24mm shorter. Besides being longer, the Sigma 17mm F4 DG DN C also has a larger diameter of 64mm 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, 39% (89g) lighter than the Sigma 17mm F4 DG DN C's weight of 225g.
Filter Threads
The Sigma 17mm F4 DG DN C has a filter size of 55mm 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 55mm filters that we recommend you to consider for the Sigma 17mm F4 DG DN C:
And these are the 39mm filters that we recommend for the Voigtlander 21mm F4 Color Skopar II:
Lens Mounts
The Sigma 17mm F4 DG DN C has the Leica L 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 Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Leica M EV1, Leica M11-D and Pixii Max for the Leica M Mount.
Sigma 17mm F4 DG DN C is also available in the Sony E mount.
Focal Range
Sigma 17mm F4 DG DN C is a prime lens with fixed focal lenght of 17mm.
On the other hand, the Voigtlander 21mm F4 Color Skopar II is a prime lens with fixed focal lenght of 21mm.
