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 8-15mm f4L Fisheye 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 8-15mm f4L Fisheye USM with a length of 83mm, is 35mm shorter. Besides being longer, the Irix 11mm F4 also has a larger diameter of 103mm compared to the Canon 8-15mm f4L Fisheye USM's 79mm 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 8-15mm f4L Fisheye USM weighs 540g, 31% (250g) lighter than the Irix 11mm F4's weight of 790g.
Lens Mounts
Both the Irix 11mm F4 and the Canon 8-15mm f4L Fisheye USM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K.
Irix 11mm F4 is also available in the 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 8-15mm f4L Fisheye USM has a focal range of 8-15mm and 1.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 12.8 - 24mm.
