The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 12mm 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. Panasonic S 18mm F1.8 is the longer of the two lenses at 82mm. The Sigma 12mm f1.4 with a length of 70mm, is 12mm shorter. Besides being longer, the Panasonic S 18mm F1.8 also has a larger diameter of 74mm compared to the Sigma 12mm f1.4'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. Sigma 12mm f1.4 weighs 235g, which means it is 105g (30%) lighter than the Panasonic S 18mm F1.8 which has a weight of 340g.
Filter Threads
The Sigma 12mm 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 Sigma 12mm f1.4:
And these are the 67mm filters that we recommend for the Panasonic S 18mm F1.8:
Lens Mounts
The Sigma 12mm f1.4 has the Fujifilm X lens mount whereas the Panasonic S 18mm F1.8 has the Leica L lens mount. Some of the latest released cameras that are compatible with these mounts are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5 for the Fujifilm X Mount and Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount.
Sigma 12mm f1.4 is also available in the Sony E and Canon RF mounts.
Focal Range
Sigma 12mm f1.4 is a prime lens with fixed focal lenght of 12mm which has an effective (full-frame 35mm equivalent) focal range of
18mm when used on a APS-C / DX format camera.
On the other hand, the Panasonic S 18mm F1.8 is a prime lens with fixed focal lenght of 18mm.
