The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 75-300mm f4.0-5.6 and the Zeiss Otus 85mm f1.4 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. Canon RF 75-300mm f4.0-5.6 is the longer of the two lenses at 146mm. The Zeiss Otus 85mm f1.4 with a length of 128mm, is 18mm shorter. On the other hand, the Zeiss Otus 85mm f1.4 has a larger diameter of 88mm compared to the Canon RF 75-300mm f4.0-5.6's 71mm 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. Canon RF 75-300mm f4.0-5.6 weighs 507g, which means it is 533g (51%) lighter than the Zeiss Otus 85mm f1.4 which has a weight of 1040g.
Filter Threads
The Canon RF 75-300mm f4.0-5.6 has a filter size of 58mm whereas the Zeiss Otus 85mm f1.4 has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the Canon RF 75-300mm f4.0-5.6:
And these are the 77mm filters that we recommend for the Zeiss Otus 85mm f1.4:
Lens Mounts
Both the Canon RF 75-300mm f4.0-5.6 and the Zeiss Otus 85mm f1.4 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 Canon EF , Nikon F (FX), Sony E and Nikon Z mounts.
Focal Range
Canon RF 75-300mm f4.0-5.6 has a focal range of 75-300mm and
4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
120 - 480mm.
On the other hand, the 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.
