The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Voigtlander 90mm F3.5 SL II and the Hartblei 80mm F2.8 IF TS for their suitability to various photography scenarios:
Size and Weight Comparison
The 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. Voigtlander 90mm F3.5 SL II weighs 320g, which means it is 530g (62%) lighter than the Hartblei 80mm F2.8 IF TS which has a weight of 850g.
Lens Mounts
Both the Voigtlander 90mm F3.5 SL II and the Hartblei 80mm F2.8 IF TS 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 K-1 II.
Voigtlander 90mm F3.5 SL II is also available in Canon EF and Nikon F (FX) mounts.
Hartblei 80mm F2.8 IF TS is also available in Canon EF , Sony Alpha and Nikon F (FX) mounts.
Focal Range
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.
Hartblei 80mm F2.8 IF TS is a prime lens with fixed focal lenght of 80mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 120mm.