The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 40mm F2 SL II and the Pentax FA 43mm F1.9 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 FA 43mm F1.9 L is the longer of the two lenses at 27mm. The Voigtlander 40mm F2 SL II with a length of 25mm, is 2mm shorter. Besides being longer, the Pentax FA 43mm F1.9 L also has a larger diameter of 64mm compared to the Voigtlander 40mm F2 SL II'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, 22% (45g) lighter than the Voigtlander 40mm F2 SL II's weight of 200g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Pentax KAF Mount for size comparison purposes.
Standard Lenses in Pentax KAF Mount for Size Comparison
Filter Threads
The Voigtlander 40mm F2 SL II has a filter size of 52mm whereas the Pentax FA 43mm F1.9 L has a 49mm 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 Voigtlander 40mm F2 SL II:
And these are the 49mm filters that we recommend for the Pentax FA 43mm F1.9 L:
Lens Mounts
Both the Voigtlander 40mm F2 SL II and the Pentax FA 43mm F1.9 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 Mono, Pentax KF and Pentax K-3 III.
Voigtlander 40mm F2 SL II is also available in the Canon EF and Nikon F (FX) mounts.
Focal Range
Voigtlander 40mm F2 SL II 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 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.
