The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 28mm F2.8 Color Skopar SL II and the Voigtlander 20mm F3.5 SL II for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Voigtlander 20mm F3.5 SL II is the longer of the two lenses at 29mm. The Voigtlander 28mm F2.8 Color Skopar SL II with a length of 25mm, is 4mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 63mm.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Voigtlander 28mm F2.8 Color Skopar SL II weighs 180g, which means it is 25g (12%) lighter than the Voigtlander 20mm F3.5 SL II which has a weight of 205g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Canon EF Mount for size comparison purposes.
Wideangle Prime Lenses in Canon EF Mount for Size Comparison
Lens Mounts
Both the Voigtlander 28mm F2.8 Color Skopar SL II and the Voigtlander 20mm F3.5 SL II has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Voigtlander 28mm F2.8 Color Skopar SL II is also available in Nikon F (FX) mount.
Voigtlander 20mm F3.5 SL II is also available in Nikon F (FX) and Pentax KAF mounts.
Focal Range
Voigtlander 28mm F2.8 Color Skopar SL II is a prime lens with fixed focal lenght of 28mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 44.8mm.
Voigtlander 20mm F3.5 SL II is a prime lens with fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 32mm.