The type of photography that you are planning to use is an important decision factor. Here we have evaluated the HD Pentax-FA 35mm F2 AL and the Voigtlander 40mm F2 SL II for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.HD Pentax-FA 35mm F2 AL is the longer of the two lenses at 45mm. The Voigtlander 40mm F2 SL II with a length of 25mm is 20mm shorter. Besides being longer, the HD Pentax-FA 35mm F2 AL also has a larger diameter of 64mm compared to Voigtlander 40mm F2 SL II's 63mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. HD Pentax-FA 35mm F2 AL weighs 193g, which means it is 7g (3%) lighter than the Voigtlander 40mm F2 SL II which has a 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 Prime Lenses in Pentax KAF Mount for Size Comparison
Both HD Pentax-FA 35mm F2 AL and Voigtlander 40mm F2 SL II has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax KF, Pentax K-3 III and Pentax KP.
Voigtlander 40mm F2 SL II is also available in Canon EF and Nikon F (FX) mounts.
HD Pentax-FA 35mm F2 AL is a prime lens with fixed focal lenght of 35mm which has a 35mm equivalent focal range of 52.5mm when used on a APS-C / DX format camera. 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 an 35mm (FF) equivalent of 60mm.