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 Voigtlander 75mm F1.8 Heliar Classic 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. Voigtlander 75mm F1.8 Heliar Classic is the longer of the two lenses at 74mm. The Leica Summarit-M 90mm F2.4 ASPH with a length of 67mm, is 7mm shorter. Besides being longer, the Voigtlander 75mm F1.8 Heliar Classic also has a larger diameter of 58mm compared to the Leica Summarit-M 90mm F2.4 ASPH's 55mm 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. Leica Summarit-M 90mm F2.4 ASPH weighs 360g, which means it is 67g (15%) lighter than the Voigtlander 75mm F1.8 Heliar Classic which has a weight of 427g.
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 90mm F2.4 ASPH and the Voigtlander 75mm F1.8 Heliar Classic 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. Voigtlander 75mm F1.8 Heliar Classic is a prime lens with fixed focal lenght of 75mm.