The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Pentax D-FA 100mm F2.8 Macro and the Voigtlander 90mm F3.5 SL II 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 D-FA 100mm F2.8 Macro is the longer of the two lenses at 81mm. The Voigtlander 90mm F3.5 SL II with a length of 52mm, is 29mm shorter. Besides being longer, the Pentax D-FA 100mm F2.8 Macro also has a larger diameter of 68mm compared to the Voigtlander 90mm F3.5 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. Voigtlander 90mm F3.5 SL II weighs 320g, 7% (25g) lighter than the Pentax D-FA 100mm F2.8 Macro's weight of 345g.
Filter Threads
The Pentax D-FA 100mm F2.8 Macro has a filter size of 49mm whereas the Voigtlander 90mm F3.5 SL II 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 49mm filters that we recommend you to consider for the Pentax D-FA 100mm F2.8 Macro:
And these are the 52mm filters that we recommend for the Voigtlander 90mm F3.5 SL II:
Lens Mounts
Both the Pentax D-FA 100mm F2.8 Macro and the Voigtlander 90mm F3.5 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 K-3 III Monochrome, Pentax KF and Pentax K-3 III.
Voigtlander 90mm F3.5 SL II is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Pentax D-FA 100mm F2.8 Macro is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
150mm.
On the other hand, the Voigtlander 90mm F3.5 SL II is a prime lens with fixed focal lenght of 90mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 135mm.