The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic S 35mm F1.8 and the HD Pentax-FA 31mm F1.8 Ltd 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 35mm F1.8 is the longer of the two lenses at 82mm. The HD Pentax-FA 31mm F1.8 Ltd with a length of 69mm, is 13mm shorter. Besides being longer, the Panasonic S 35mm F1.8 also has a larger diameter of 74mm compared to the HD Pentax-FA 31mm F1.8 Ltd's 65mm diameter.
Below you can find a scaled side-by-side image of Panasonic S 35mm F1.8 and HD Pentax-FA 31mm F1.8 Ltd to get a better idea of how their sizes compare in real life.
Comparison image of the Panasonic S 35mm F1.8 and the HD Pentax-FA 31mm F1.8 Ltd Size and Weight 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 35mm F1.8 weighs 295g, which means it is 46g (13%) lighter than the HD Pentax-FA 31mm F1.8 Ltd which has a weight of 341g.
Filter Threads
The Panasonic S 35mm F1.8 has a filter size of 67mm whereas the HD Pentax-FA 31mm F1.8 Ltd has a 58mm 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 Panasonic S 35mm F1.8:
And these are the 58mm filters that we recommend for the HD Pentax-FA 31mm F1.8 Ltd:
Lens Mounts
The Panasonic S 35mm F1.8 has the Leica L lens mount whereas the HD Pentax-FA 31mm F1.8 Ltd has the Pentax KAF lens mount . Some of the latest released cameras that are compatible with these mounts are Leica SL3-P , Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Pentax K-3 III Mono , Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Focal Range
Panasonic S 35mm F1.8 is a prime lens with fixed focal lenght of 35mm.
On the other hand, the HD Pentax-FA 31mm F1.8 Ltd is a prime lens with fixed focal lenght of 31mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 46.5mm .
