The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Irix 11mm F4 and the Canon 24mm f2.8 IS USM 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. Irix 11mm F4 is the longer of the two lenses at 118mm. The Canon 24mm f2.8 IS USM with a length of 56mm, is 62mm shorter. Besides being longer, the Irix 11mm F4 also has a larger diameter of 103mm compared to the Canon 24mm f2.8 IS USM's 68mm 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 24mm f2.8 IS USM weighs 280g, 64% (510g) lighter than the Irix 11mm F4's weight of 790g.
Lens Mounts
Both the Irix 11mm F4 and the Canon 24mm f2.8 IS USM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Irix 11mm F4 is also available in Nikon F (FX) and Pentax KAF3 mounts.
Focal Range
Irix 11mm F4 is a prime lens with fixed focal lenght of 11mm.
On the other hand, the Canon 24mm f2.8 IS USM 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.