The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 24mm F1.8 IS and the Irix 45mm F1.4 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. Canon RF 24mm F1.8 IS weighs 270g, which means it is 655g (70%) lighter than the Irix 45mm F1.4 which has a weight of 925g.
Filter Threads
The Canon RF 24mm F1.8 IS has a filter size of 52mm whereas the Irix 45mm 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 52mm filters that we recommend you to consider for the Canon RF 24mm F1.8 IS:
And these are the 77mm filters that we recommend for the Irix 45mm F1.4:
Lens Mounts
The Canon RF 24mm F1.8 IS has the Canon RF lens mount whereas the Irix 45mm F1.4 has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Canon R6 V, Canon R6 III and Canon C50 for the Canon RF Mount and Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Irix 45mm F1.4 is also available in Nikon F (FX) and Pentax KAF2 mounts.
Focal Range
Canon RF 24mm F1.8 IS is a prime lens with fixed focal lenght of 24mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
38.4mm.
On the other hand, the 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.
