The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 58mm F1.4 SL II and the Pentax 50mm F1.8 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. Voigtlander 58mm F1.4 SL II is the longer of the two lenses at 48mm. The Pentax 50mm F1.8 with a length of 39mm, is 9mm shorter. Besides being longer, the Voigtlander 58mm F1.4 SL II also has a larger diameter of 64mm compared to the Pentax 50mm F1.8'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 50mm F1.8 weighs 122g, 61% (198g) lighter than the Voigtlander 58mm F1.4 SL II's weight of 320g.
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
The Voigtlander 58mm F1.4 SL II has a filter size of 58mm whereas the Pentax 50mm F1.8 has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the Voigtlander 58mm F1.4 SL II:
And these are the 52mm filters that we recommend for the Pentax 50mm F1.8:
Both the Voigtlander 58mm F1.4 SL II and the Pentax 50mm F1.8 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.
Voigtlander 58mm F1.4 SL II is also available in Nikon F (FX) mount.
Voigtlander 58mm F1.4 SL II is a prime lens with fixed focal lenght of 58mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 87mm
On the other hand, the Pentax 50mm F1.8 is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 75mm.