The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 75mm F1.8 Heliar Classic and the Leica APO 90mm f2 ASPH 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. Leica APO 90mm f2 ASPH is the longer of the two lenses at 78mm. The Voigtlander 75mm F1.8 Heliar Classic with a length of 74mm, is 4mm shorter. Besides being longer, the Leica APO 90mm f2 ASPH also has a larger diameter of 64mm compared to the Voigtlander 75mm F1.8 Heliar Classic's 58mm 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. Voigtlander 75mm F1.8 Heliar Classic weighs 427g, which means it is 73g (14%) lighter than the Leica APO 90mm f2 ASPH which has a weight of 500g.
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 Voigtlander 75mm F1.8 Heliar Classic and the Leica APO 90mm f2 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
Voigtlander 75mm F1.8 Heliar Classic is a prime lens with fixed focal lenght of 75mm. Leica APO 90mm f2 ASPH is a prime lens with fixed focal lenght of 90mm.