The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Nikon Z 40mm F2 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 Nikon Z 40mm F2 with a length of 46mm, is 23mm shorter. On the other hand, the Nikon Z 40mm F2 has a larger diameter of 70mm compared to the HD Pentax-FA 31mm F1.8 Ltd's 65mm diameter.
Below you can find a scaled side-by-side image of Nikon Z 40mm F2 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 Nikon Z 40mm F2 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. Nikon Z 40mm F2 weighs 170g, which means it is 171g (50%) lighter than the HD Pentax-FA 31mm F1.8 Ltd which has a weight of 341g.
Filter Threads
The Nikon Z 40mm F2 has a filter size of 52mm 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 52mm filters that we recommend you to consider for the Nikon Z 40mm F2:
And these are the 58mm filters that we recommend for the HD Pentax-FA 31mm F1.8 Ltd:
Lens Mounts
The Nikon Z 40mm F2 has the Nikon Z 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 Nikon ZR , Nikon Z5 II and RED Komodo-X 6K Z for the Nikon Z Mount and Pentax K-3 III Mono , Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Focal Range
Nikon Z 40mm F2 is a prime lens with fixed focal lenght of 40mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
60mm .
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 .
