The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Venus 100mm F2.8 2X Ultra Macro and the Carl Zeiss Makro-Planar T2/50 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. Venus 100mm F2.8 2X Ultra Macro is the longer of the two lenses at 125mm. The Carl Zeiss Makro-Planar T2/50 with a length of 88mm, is 37mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 72mm.
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 T2/50 weighs 530g, 16% (108g) lighter than the Venus 100mm F2.8 2X Ultra Macro's weight of 638g.
Filter Threads
Both the Venus 100mm F2.8 2X Ultra Macro and the Carl Zeiss Makro-Planar T2/50 have the same Filter thread size of 67mm.
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Venus 100mm F2.8 2X Ultra Macro has the Pentax KAF2 lens mount whereas the Carl Zeiss Makro-Planar T2/50 has the Pentax KAF lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF2 Mount and Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount.
Venus 100mm F2.8 2X Ultra Macro is also available in the Canon EF , Nikon F (FX) and Sony E mounts.
Carl Zeiss Makro-Planar T2/50 is also available in Canon EF and Nikon F (FX) mounts.
Focal Range
Venus 100mm F2.8 2X Ultra 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 Carl Zeiss Makro-Planar T2/50 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.
