The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Hartblei 80mm F2.8 IF TS and the Carl Zeiss Makro-Planar T2/100 for their suitability to various photography scenarios:
Size and Weight Comparison
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. Carl Zeiss Makro-Planar T2/100 weighs 680g, 19% (170g) lighter than the Hartblei 80mm F2.8 IF TS's weight of 850g.
Filter Threads
The Hartblei 80mm F2.8 IF TS has a filter size of 72mm whereas the Carl Zeiss Makro-Planar T2/100 has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Hartblei 80mm F2.8 IF TS:
And these are the 67mm filters that we recommend for the Carl Zeiss Makro-Planar T2/100:
Lens Mounts
Both the Hartblei 80mm F2.8 IF TS and the Carl Zeiss Makro-Planar T2/100 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.
Hartblei 80mm F2.8 IF TS is also available in Canon EF , Sony Alpha and Nikon F (FX) mounts.
Carl Zeiss Makro-Planar T2/100 is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
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.
On the other hand, the Carl Zeiss Makro-Planar T2/100 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.