The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Hartblei 40mm F4 IF TS and the Carl Zeiss Planar T1,4/50 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 Planar T1,4/50 weighs 350g, 77% (1200g) lighter than the Hartblei 40mm F4 IF TS's weight of 1550g.
Filter Threads
The Hartblei 40mm F4 IF TS has a filter size of 86mm whereas the Carl Zeiss Planar T1,4/50 has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 86mm filters that we recommend you to consider for the Hartblei 40mm F4 IF TS:
And these are the 58mm filters that we recommend for the Carl Zeiss Planar T1,4/50:
Lens Mounts
Both the Hartblei 40mm F4 IF TS and the Carl Zeiss Planar T1,4/50 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 40mm F4 IF TS is also available in Canon EF , Sony Alpha and Nikon F (FX) mounts.
Carl Zeiss Planar T1,4/50 is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Hartblei 40mm F4 IF TS 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 a 35mm (FF) equivalent of
60mm.
On the other hand, the Carl Zeiss Planar T1,4/50 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.