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 Zeiss Milvus 15mm F2.8 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 Zeiss Milvus 15mm F2.8 with a length of 100mm, is 18mm shorter. Besides being longer, the Irix 11mm F4 also has a larger diameter of 103mm compared to the Zeiss Milvus 15mm F2.8's 102mm 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. Irix 11mm F4 weighs 790g, which means it is 157g (16%) lighter than the Zeiss Milvus 15mm F2.8 which has a weight of 947g.
Lens Mounts
The Irix 11mm F4 has the Nikon F (FX) lens mount whereas the Zeiss Milvus 15mm F2.8 has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) 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 11mm F4 is also available in the Canon EF and Pentax KAF3 mounts.
Zeiss Milvus 15mm F2.8 is also available in Nikon F (FX) mount.
Focal Range
Irix 11mm F4 is a prime lens with fixed focal lenght of 11mm.
On the other hand, the Zeiss Milvus 15mm F2.8 is a prime lens with fixed focal lenght of 15mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 24mm.
