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 Pentax 35mm F2.8 Macro L 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. Pentax 35mm F2.8 Macro L is the longer of the two lenses at 47mm. The Pentax FA 43mm F1.9 L with a length of 27mm, is 20mm shorter. On the other hand, the Pentax FA 43mm F1.9 L has a larger diameter of 64mm compared to the Pentax 35mm F2.8 Macro L'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 59g (27%) lighter than the Pentax 35mm F2.8 Macro L which has a weight of 214g.
Filter Threads
Both the Pentax FA 43mm F1.9 L and the Pentax 35mm F2.8 Macro L have the same Filter thread size of 49mm.
Below are links to the 49mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Pentax FA 43mm F1.9 L and the Pentax 35mm F2.8 Macro L 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.
Pentax 35mm F2.8 Macro L is also available in Pentax KAF mount.
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 Pentax 35mm F2.8 Macro L is a prime lens with fixed focal lenght of 35mm which has an effective (full-frame 35mm equivalent) focal range of 52.5mm when used on a APS-C / DX format camera.