The type of photography that you are planning to use is an important decision factor. Here we have evaluated the HD Pentax-FA 43mm F1.9 Ltd and the Panasonic 42.5mm F1.7 OIS 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 42.5mm F1.7 OIS is the longer of the two lenses at 50mm. The HD Pentax-FA 43mm F1.9 Ltd with a length of 27mm, is 23mm shorter. On the other hand, the HD Pentax-FA 43mm F1.9 Ltd has a larger diameter of 64mm compared to the Panasonic 42.5mm F1.7 OIS's 55mm diameter.
Below you can find a scaled side-by-side image of HD Pentax-FA 43mm F1.9 Ltd and Panasonic 42.5mm F1.7 OIS to get a better idea of how their sizes compare in real life.
Comparison image of the HD Pentax-FA 43mm F1.9 Ltd and the Panasonic 42.5mm F1.7 OIS 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 42.5mm F1.7 OIS weighs 130g, 16% (25g) lighter than the HD Pentax-FA 43mm F1.9 Ltd's weight of 155g.
Filter Threads
The HD Pentax-FA 43mm F1.9 Ltd has a filter size of 49mm whereas the Panasonic 42.5mm F1.7 OIS has a 37mm 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 43mm F1.9 Ltd:
And these are the 37mm filters that we recommend for the Panasonic 42.5mm F1.7 OIS:
Lens Mounts
The HD Pentax-FA 43mm F1.9 Ltd has the Pentax KAF lens mount whereas the Panasonic 42.5mm F1.7 OIS has the Micro Four Thirds lens mount . Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Mono , Pentax KF and Pentax K-3 III for the Pentax KAF Mount and OM System OM-3 Astro , OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Focal Range
Both lenses have the same focal range of
43mm but while HD Pentax-FA 43mm F1.9 Ltd has the fastest aperture of
F1.9 , the Panasonic 42.5mm F1.7 OIS's widest aperture value is
F1.7 .
