The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Carl Zeiss Makro-Planar T2/100 and the Venus 100mm F2.8 2X Ultra Macro 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 T2/100 with a length of 113mm, is 12mm shorter. On the other hand, the Carl Zeiss Makro-Planar T2/100 has a larger diameter of 76mm compared to the Venus 100mm F2.8 2X Ultra Macro's 72mm 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. Venus 100mm F2.8 2X Ultra Macro weighs 638g, 6% (42g) lighter than the Carl Zeiss Makro-Planar T2/100's weight of 680g.
Filter Threads
Both the Carl Zeiss Makro-Planar T2/100 and the Venus 100mm F2.8 2X Ultra Macro 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 Carl Zeiss Makro-Planar T2/100 has the Pentax KAF lens mount whereas the Venus 100mm F2.8 2X Ultra Macro has the Pentax KAF2 lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III for the Pentax KAF Mount and Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III for the Pentax KAF2 Mount.
Carl Zeiss Makro-Planar T2/100 is also available in Canon EF and Nikon F (FX) mounts.
Venus 100mm F2.8 2X Ultra Macro is also available in Canon EF , Nikon F (FX) and Sony E mounts.
Focal Range
Both lenses have the same focal range of
100mm but while Carl Zeiss Makro-Planar T2/100 has the fastest aperture of
F2.0, the Venus 100mm F2.8 2X Ultra Macro's widest aperture value is
F2.8.