The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica APO-Summicron-M 35mm F2 ASPH 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 APO-Summicron-M 35mm F2 ASPH is the longer of the two lenses at 41mm. The Leica Summarit-M 35mm f2.5 with a length of 34mm, is 7mm shorter. Besides being longer, the Leica APO-Summicron-M 35mm F2 ASPH also has a larger diameter of 53mm 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. Leica Summarit-M 35mm f2.5 weighs 220g, 31% (100g) lighter than the Leica APO-Summicron-M 35mm F2 ASPH's weight of 320g.
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
Both the Leica APO-Summicron-M 35mm F2 ASPH and the Leica Summarit-M 35mm f2.5 have the same Filter thread size of 39mm.
Below are links to the 39mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Leica APO-Summicron-M 35mm F2 ASPH 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 APO-Summicron-M 35mm F2 ASPH is a prime lens with fixed focal lenght of 35mm.
On the other hand, the Leica Summarit-M 35mm f2.5 is a prime lens with fixed focal lenght of 25-35mm.