The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sirui 35mm F1.4 and the Panasonic S 18mm F1.8 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. Sirui 35mm F1.4 is the longer of the two lenses at 101mm. The Panasonic S 18mm F1.8 with a length of 82mm, is 19mm shorter. Besides being longer, the Sirui 35mm F1.4 also has a larger diameter of 76mm compared to the Panasonic S 18mm F1.8's 74mm 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. Panasonic S 18mm F1.8 weighs 340g, 31% (154g) lighter than the Sirui 35mm F1.4's weight of 494g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Leica L Mount for size comparison purposes.
Wideangle Lenses in Leica L Mount for Size Comparison
Filter Threads
The Sirui 35mm F1.4 has a filter size of 62mm whereas the Panasonic S 18mm F1.8 has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Sirui 35mm F1.4:
And these are the 67mm filters that we recommend for the Panasonic S 18mm F1.8:
Lens Mounts
Both the Sirui 35mm F1.4 and the Panasonic S 18mm F1.8 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.
Sirui 35mm F1.4 is also available in the Sony E , Nikon Z and Fujifilm X mounts.
Focal Range
Sirui 35mm F1.4 is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
52.5mm.
On the other hand, the Panasonic S 18mm F1.8 is a prime lens with fixed focal lenght of 18mm.
