The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summarit-M 90mm F2.4 ASPH and the Leica Summarit-M 75mm F2.4 ASPH 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 90mm F2.4 ASPH is the longer of the two lenses at 67mm. The Leica Summarit-M 75mm F2.4 ASPH with a length of 61mm, is 6mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 55mm.
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Below you can find a scaled side-by-side image of Leica Summarit-M 90mm F2.4 ASPH and Leica Summarit-M 75mm F2.4 ASPH to get a better idea of how their sizes compare in real life.
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 75mm F2.4 ASPH weighs 325g, 9% (35g) lighter than the Leica Summarit-M 90mm F2.4 ASPH's weight of 360g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Leica M Mount for size comparison purposes.
Telephoto Lenses in Leica M Mount for Size Comparison
Filter Threads
Both the Leica Summarit-M 90mm F2.4 ASPH and the Leica Summarit-M 75mm F2.4 ASPH have the same Filter thread size of 46mm.
Below are links to the 46mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Leica Summarit-M 90mm F2.4 ASPH and the Leica Summarit-M 75mm F2.4 ASPH 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 Summarit-M 90mm F2.4 ASPH is a prime lens with fixed focal lenght of 90mm.
On the other hand, the Leica Summarit-M 75mm F2.4 ASPH is a prime lens with fixed focal lenght of 75mm.