The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax FA 43mm F1.9 L and the Rokinon 35mm f1.4 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. Rokinon 35mm f1.4 is the longer of the two lenses at 112mm. The Pentax FA 43mm F1.9 L with a length of 27mm, is 85mm shorter. On the other hand, the Pentax FA 43mm F1.9 L has a larger diameter of 64mm compared to the Rokinon 35mm f1.4's 63mm 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. Pentax FA 43mm F1.9 L weighs 155g, which means it is 505g (76%) lighter than the Rokinon 35mm f1.4 which has a weight of 660g.
Filter Threads
The Pentax FA 43mm F1.9 L has a filter size of 49mm whereas the Rokinon 35mm f1.4 has a 77mm 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 Pentax FA 43mm F1.9 L:
And these are the 77mm filters that we recommend for the Rokinon 35mm f1.4:
Lens Mounts
Both the Pentax FA 43mm F1.9 L and the Rokinon 35mm f1.4 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 Monochrome, Pentax KF and Pentax K-3 III.
Rokinon 35mm f1.4 is also available in Canon EF , Nikon F (FX), Four Thirds, Sony Alpha and Samsung NX mounts.
Focal Range
Pentax FA 43mm F1.9 L is a prime lens with fixed focal lenght of 43mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
64.5mm.
On the other hand, the Rokinon 35mm f1.4 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.