The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Zeiss Otus 85mm f1.4 and the Voigtlander 75mm f1.5 RF 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 85mm f1.4 is the longer of the two lenses at 128mm. The Voigtlander 75mm f1.5 RF with a length of 72mm, is 56mm shorter. Besides being longer, the Zeiss Otus 85mm f1.4 also has a larger diameter of 88mm compared to the Voigtlander 75mm f1.5 RF's 74mm 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. Voigtlander 75mm f1.5 RF weighs 525g, 49% (515g) lighter than the Zeiss Otus 85mm f1.4's weight of 1040g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Canon RF Mount for size comparison purposes.
Telephoto Lenses in Canon RF Mount for Size Comparison
Filter Threads
The Zeiss Otus 85mm f1.4 has a filter size of 77mm whereas the Voigtlander 75mm f1.5 RF has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Zeiss Otus 85mm f1.4:
And these are the 62mm filters that we recommend for the Voigtlander 75mm f1.5 RF:
Lens Mounts
Both the Zeiss Otus 85mm f1.4 and the Voigtlander 75mm f1.5 RF has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R6 V, Canon R6 III and Canon C50.
Zeiss Otus 85mm f1.4 is also available in the Canon EF , Nikon F (FX), Sony E and Nikon Z mounts.
Focal Range
Zeiss Otus 85mm f1.4 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.
On the other hand, the Voigtlander 75mm f1.5 RF is a prime lens with fixed focal lenght of 75mm which has an effective (full-frame 35mm equivalent) focal range of 112.5mm when used on a 35mm FF format camera.
