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 18-40mm F4.5-6.3 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 18-40mm F4.5-6.3 with a length of 41mm, is 60mm shorter. Besides being longer, the Sirui 35mm F1.4 also has a larger diameter of 76mm compared to the Panasonic 18-40mm F4.5-6.3's 68mm 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 18-40mm F4.5-6.3 weighs 155g, 68% (339g) lighter than the Sirui 35mm F1.4's weight of 494g.
Filter Threads
Both the Sirui 35mm F1.4 and the Panasonic 18-40mm F4.5-6.3 have the same Filter thread size of 62mm.
Below are links to the 62mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sirui 35mm F1.4 and the Panasonic 18-40mm F4.5-6.3 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 18-40mm F4.5-6.3 has a focal range of 18-40mm and 2.2X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 27 - 60mm.
