The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 35mm F2 DG DN and the Voigtlander 21mm F1.8 Ultron 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. Voigtlander 21mm F1.8 Ultron is the longer of the two lenses at 92mm. The Sigma 35mm F2 DG DN with a length of 65mm, is 27mm shorter. On the other hand, the Sigma 35mm F2 DG DN has a larger diameter of 70mm compared to the Voigtlander 21mm F1.8 Ultron's 62mm 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. Sigma 35mm F2 DG DN weighs 325g, which means it is 87g (21%) lighter than the Voigtlander 21mm F1.8 Ultron which has a weight of 412g.
Filter Threads
Both the Sigma 35mm F2 DG DN and the Voigtlander 21mm F1.8 Ultron have the same Filter thread size of 58mm.
Below are links to the 58mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 35mm F2 DG DN has the Sony E lens mount whereas the Voigtlander 21mm F1.8 Ultron 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 35mm F2 DG DN is also available in the Leica L mount.
Focal Range
Sigma 35mm F2 DG DN is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
52.5mm.
On the other hand, the Voigtlander 21mm F1.8 Ultron is a prime lens with fixed focal lenght of 21mm.
