The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Leica SL 100mm F2.8 and the Kase 85mm F1.4 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 SL 100mm F2.8 is the longer of the two lenses at 137mm. The Kase 85mm F1.4 with a length of 99mm, is 38mm shorter. On the other hand, the Kase 85mm F1.4 has a larger diameter of 82mm compared to the Leica SL 100mm F2.8's 77mm 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. Kase 85mm F1.4 weighs 580g, 27% (221g) lighter than the Leica SL 100mm F2.8's weight of 801g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Leica L Mount for size comparison purposes.
Telephoto Lenses in Leica L Mount for Size Comparison
Filter Threads
The Leica SL 100mm F2.8 has a filter size of 67mm whereas the Kase 85mm F1.4 has a 72mm 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 SL 100mm F2.8:
And these are the 72mm filters that we recommend for the Kase 85mm F1.4:
Lens Mounts
Both the Leica SL 100mm F2.8 and the Kase 85mm F1.4 has the same Leica L lens mount. Some of the latest released cameras that are compatible with the Leica L lenses are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE.
Kase 85mm F1.4 is also available in Sony E , Nikon Z and Fujifilm X mounts.
Focal Range
Leica SL 100mm F2.8 is a prime lens with fixed focal lenght of 100mm.
On the other hand, the Kase 85mm F1.4 is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 127.5mm.
