The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 15mm F4.5 and the Leica Summarit-M 35mm f2.5 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 15mm F4.5 is the longer of the two lenses at 38mm. The Leica Summarit-M 35mm f2.5 with a length of 34mm, is 4mm shorter. Besides being longer, the Voigtlander 15mm F4.5 also has a larger diameter of 59mm compared to the Leica Summarit-M 35mm f2.5's 51mm 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 15mm F4.5 weighs 156g, which means it is 64g (29%) lighter than the Leica Summarit-M 35mm f2.5 which has a weight of 220g.
Filter Threads
The Voigtlander 15mm F4.5 has a filter size of 52mm whereas the Leica Summarit-M 35mm f2.5 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 52mm filters that we recommend you to consider for the Voigtlander 15mm F4.5:
And these are the 39mm filters that we recommend for the Leica Summarit-M 35mm f2.5:
Lens Mounts
Both the Voigtlander 15mm F4.5 and the Leica Summarit-M 35mm f2.5 has the same Leica M lens mount. Some of the latest released cameras that are compatible with the Leica M lenses are Leica M11 Monochrome, Leica M11 and Leica M10.
Focal Range
Voigtlander 15mm F4.5 is a prime lens with fixed focal lenght of 15mm.
On the other hand, the Leica Summarit-M 35mm f2.5 is a prime lens with fixed focal lenght of 25-35mm.