The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Irix 45mm F1.4 and the Canon RF 85mm F1.2L USM for their suitability to various photography scenarios:
Size and Weight Comparison
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. Irix 45mm F1.4 weighs 925g, which means it is 270g (22%) lighter than the Canon RF 85mm F1.2L USM which has a weight of 1195g.
Filter Threads
The Irix 45mm F1.4 has a filter size of 77mm whereas the Canon RF 85mm F1.2L USM 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 77mm filters that we recommend you to consider for the Irix 45mm F1.4:
And these are the 82mm filters that we recommend for the Canon RF 85mm F1.2L USM:
Lens Mounts
The Irix 45mm F1.4 has the Canon EF lens mount whereas the Canon RF 85mm F1.2L USM has the Canon RF 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 Canon R6 V, Canon R6 III and Canon C50 for the Canon RF Mount.
Irix 45mm F1.4 is also available in the Nikon F (FX) and Pentax KAF2 mounts.
Focal Range
Irix 45mm F1.4 is a prime lens with fixed focal lenght of 45mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
72mm.
On the other hand, the Canon RF 85mm F1.2L USM is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 136mm.
