The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summarit-M 75mm f2.5 and the Carl Zeiss Tele-Tessar 4/85 ZM for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Carl Zeiss Tele-Tessar 4/85 ZM is the longer of the two lenses at 95mm. The Leica Summarit-M 75mm f2.5 with a length of 61mm, is 34mm shorter. On the other hand, the Leica Summarit-M 75mm f2.5 has a larger diameter of 55mm compared to the Carl Zeiss Tele-Tessar 4/85 ZM's 54mm diameter.
The weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Carl Zeiss Tele-Tessar 4/85 ZM weighs 310g, 10% (35g) lighter than the Leica Summarit-M 75mm f2.5's weight of 345g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Leica M Mount for size comparison purposes.
Telephoto Prime Lenses in Leica M Mount for Size Comparison
Lens Mounts
Both the Leica Summarit-M 75mm f2.5 and the Carl Zeiss Tele-Tessar 4/85 ZM 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 75mm f2.5 is a prime lens with fixed focal lenght of 75mm. Carl Zeiss Tele-Tessar 4/85 ZM is a prime lens with fixed focal lenght of 85mm.