The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica Noctilux-M 75mm F1.25 ASPH and the Leica APO 50mm f2 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 Noctilux-M 75mm F1.25 ASPH is the longer of the two lenses at 91mm. The Leica APO 50mm f2 ASPH with a length of 47mm, is 44mm shorter. Besides being longer, the Leica Noctilux-M 75mm F1.25 ASPH also has a larger diameter of 74mm compared to the Leica APO 50mm f2 ASPH's 53mm diameter.
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 APO 50mm f2 ASPH weighs 300g, 71% (755g) lighter than the Leica Noctilux-M 75mm F1.25 ASPH's weight of 1055g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Leica M Mount for size comparison purposes.
Standard Lenses in Leica M Mount for Size Comparison
Filter Threads
The Leica Noctilux-M 75mm F1.25 ASPH has a filter size of 67mm whereas the Leica APO 50mm f2 ASPH has a 39mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Leica Noctilux-M 75mm F1.25 ASPH:
And these are the 39mm filters that we recommend for the Leica APO 50mm f2 ASPH:
Lens Mounts
Both the Leica Noctilux-M 75mm F1.25 ASPH and the Leica APO 50mm 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 M EV1, Leica M11-D and Pixii Max.
Focal Range
Leica Noctilux-M 75mm F1.25 ASPH is a prime lens with fixed focal lenght of 75mm.
On the other hand, the Leica APO 50mm f2 ASPH is a prime lens with fixed focal lenght of 50mm.
