The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summaron-M 28mm F5.6 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. Leica Summarit-M 35mm f2.5 is the longer of the two lenses at 34mm. The Leica Summaron-M 28mm F5.6 with a length of 18mm, is 16mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 51mm.
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. Leica Summaron-M 28mm F5.6 weighs 165g, which means it is 55g (25%) lighter than the Leica Summarit-M 35mm f2.5 which has a weight of 220g.
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 Leica Summaron-M 28mm F5.6 has a filter size of 34mm 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 34mm filters that we recommend you to consider for the Leica Summaron-M 28mm F5.6:
And these are the 39mm filters that we recommend for the Leica Summarit-M 35mm f2.5:
Lens Mounts
Both the Leica Summaron-M 28mm F5.6 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
Leica Summaron-M 28mm F5.6 is a prime lens with fixed focal lenght of 28mm.
On the other hand, the Leica Summarit-M 35mm f2.5 is a prime lens with fixed focal lenght of 25-35mm.