The type of photography that you are planning to use is an important decision factor. Here we have evaluated the HD Pentax-FA 35mm F2 AL 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. HD Pentax-FA 31mm F1.8 Ltd is the longer of the two lenses at 69mm. The HD Pentax-FA 35mm F2 AL with a length of 45mm, is 24mm shorter. Besides being longer, the HD Pentax-FA 31mm F1.8 Ltd also has a larger diameter of 65mm compared to the HD Pentax-FA 35mm F2 AL's 64mm diameter.
Below you can find a scaled side-by-side image of HD Pentax-FA 35mm F2 AL 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 HD Pentax-FA 35mm F2 AL 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. HD Pentax-FA 35mm F2 AL weighs 193g, which means it is 148g (43%) lighter than the HD Pentax-FA 31mm F1.8 Ltd which has a weight of 341g.
Filter Threads
The HD Pentax-FA 35mm F2 AL has a filter size of 49mm 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 49mm filters that we recommend you to consider for the HD Pentax-FA 35mm F2 AL:
And these are the 58mm filters that we recommend for the HD Pentax-FA 31mm F1.8 Ltd:
Lens Mounts
Both the HD Pentax-FA 35mm F2 AL and the HD Pentax-FA 31mm F1.8 Ltd has the same Pentax KAF lens mount . Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax K-3 III Mono , Pentax KF and Pentax K-3 III .
Focal Range
HD Pentax-FA 35mm F2 AL 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 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 .
