The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Summarit-M 75mm F2.4 ASPH and the Leica APO 90mm f2 ASPH for their suitability to various photography scenarios:
Size and Weight Comparison
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 Leica Summarit-M 75mm F2.4 ASPH with a length of 61mm is 17mm shorter. Besides being longer, the Leica APO 90mm f2 ASPH also has a larger diameter of 64mm compared to Leica Summarit-M 75mm F2.4 ASPH's 55mm diameter.
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 75mm F2.4 ASPH weighs 325g, which means it is 175g (35%) 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 Leica Summarit-M 75mm F2.4 ASPH and 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, Leica M10 and Leica M Typ 262.
Focal Range
Leica Summarit-M 75mm F2.4 ASPH 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.