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 Olympus ED 12-40mm f2.8 PRO 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 Olympus ED 12-40mm f2.8 PRO with a length of 84mm, is 34mm shorter. Besides being longer, the Irix 11mm F4 also has a larger diameter of 103mm compared to the Olympus ED 12-40mm f2.8 PRO's 70mm diameter.
Below you can find a scaled side-by-side image of Irix 11mm F4 and Olympus ED 12-40mm f2.8 PRO to get a better idea of how their sizes compare in real life.
Comparison image of the Irix 11mm F4 and the Olympus ED 12-40mm f2.8 PRO Size and Weight 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. Olympus ED 12-40mm f2.8 PRO weighs 382g, 51% (408g) lighter than the Irix 11mm F4's weight of 790g.
Lens Mounts
The Irix 11mm F4 has the Canon EF lens mount whereas the Olympus ED 12-40mm f2.8 PRO has the Micro Four Thirds 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 OM System OM-3 Astro , OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
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 Olympus ED 12-40mm f2.8 PRO has a focal range of 12-40mm and 3.3X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 24-80mm when used on a FourThirds format camera.
