The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Zeiss Otus 100mm F1.4 and the Pentax-D FA 85mm F1.4 ED SDM AW 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. Zeiss Otus 100mm F1.4 is the longer of the two lenses at 129mm. The Pentax-D FA 85mm F1.4 ED SDM AW with a length of 124mm, is 5mm shorter. Besides being longer, the Zeiss Otus 100mm F1.4 also has a larger diameter of 101mm compared to the Pentax-D FA 85mm F1.4 ED SDM AW's 95mm diameter.
Below you can find a scaled side-by-side image of Zeiss Otus 100mm F1.4 and Pentax-D FA 85mm F1.4 ED SDM AW to get a better idea of how their sizes compare in real life.
Comparison image of the Zeiss Otus 100mm F1.4 and the Pentax-D FA 85mm F1.4 ED SDM AW Size and Weight 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. Pentax-D FA 85mm F1.4 ED SDM AW weighs 1255g, 10% (150g) lighter than the Zeiss Otus 100mm F1.4's weight of 1405g.
Filter Threads
The Zeiss Otus 100mm F1.4 has a filter size of 86mm whereas the Pentax-D FA 85mm F1.4 ED SDM AW has a 82mm 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 Zeiss Otus 100mm F1.4:
And these are the 82mm filters that we recommend for the Pentax-D FA 85mm F1.4 ED SDM AW:
Lens Mounts
The Zeiss Otus 100mm F1.4 has the Canon EF lens mount whereas the Pentax-D FA 85mm F1.4 ED SDM AW has the Pentax KAF4 lens mount . Some of the latest released cameras that are compatible with these mounts are Blackmagic URSA 12K LF , Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount and
Focal Range
Zeiss Otus 100mm F1.4 is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
160mm .
On the other hand, the Pentax-D FA 85mm F1.4 ED SDM AW is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 127.5mm .
