The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 28mm F2 Ultron 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. Voigtlander 28mm F2 Ultron is the longer of the two lenses at 51mm. The Voigtlander 21mm F4 Color Skopar II with a length of 25mm, is 26mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 55mm.
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, 44% (108g) lighter than the Voigtlander 28mm F2 Ultron's weight of 244g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Leica M Mount for size comparison purposes.
Wideangle Lenses in Leica M Mount for Size Comparison
Filter Threads
The Voigtlander 28mm F2 Ultron has a filter size of 46mm 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 46mm filters that we recommend you to consider for the Voigtlander 28mm F2 Ultron:
And these are the 39mm filters that we recommend for the Voigtlander 21mm F4 Color Skopar II:
Lens Mounts
Both the Voigtlander 28mm F2 Ultron and the Voigtlander 21mm F4 Color Skopar II has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M EV1, Leica M11-D and Pixii Max.
Focal Range
Voigtlander 28mm F2 Ultron is a prime lens with fixed focal lenght of 28mm.
On the other hand, the Voigtlander 21mm F4 Color Skopar II is a prime lens with fixed focal lenght of 21mm.
