Irix 11mm F4 is a Fixed aperture Manual Focus (MF) Ultra-Wideangle Prime
lens with 35mm FF max sensor coverage, and it is designed to be used with Pentax KAF3 mount cameras.
What type of photography is the Irix 11mm F4 lens good for?
The type of photography that you are planning to use the Irix 11mm F4 is an important decision factor. Here we have evaluated its suitability to various photography scenarios:
Reasons to Buy Irix 11mm F4 Lens
Here, we've included a summary of the advantages and disadvantages of the Irix 11mm F4 lens in a list form to help you determine whether it offers the features you need.
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| Weather Sealed
| Aperture Ring
| Distance Scale
| DoF(Depth of Field) Scale
| Hood supplied
| Full-time Manual Focusing
| Covers Full-Frame Sensor
|9 Diaphragm Blades
| Extreme Wide-angle capability
| Minimum focus distance of 0.28m / 11.0 inch
Buy Irix 11mm F4 from Amazon or B&H PHOTO
| No Autofocus
| Not so fast for a short Prime Lens
Irix 11mm F4 is compatible with cameras that have Pentax KAF3 lens mount. Some of the latest released cameras that are compatible with the Pentax KAF3 lenses are Pentax KF, Pentax K-3 III and Pentax K-1 II.
Irix 11mm F4 is also available in Canon EF and Nikon F (FX) mounts.
Size, Weight and Filter Thread
Size and weight is a very important decision factor when searching for your next lens. Irix 11mm F4 has a maximum diameter of 103mm and total length of 118mm. It weighs 790g / 27.9 oz.
Irix 11mm F4 has a fixed focal lenght of 11mm.
Irix 11mm F4 is a weather sealed lens which provides an extra protection to prevent water and dust get inside the lens and camera body under light rain, snow and wind. In order to have an effective protection, you have to pair the Irix 11mm F4 with a weather sealed camera body such as Pentax KF, Pentax K-3 III and Pentax K-1 II.
Optical Image Stabilization
Irix 11mm F4 doesn't have an optical image stabilization system so the only option to stabilize the image taken with this lens is to mount on a camera body with IBIS (sensor based In-body image stabilization).
Maximum Magnification Ratio
Irix 11mm F4 has a Max Magnification Ratio of 0.07x and has a minimum focusing distance of 0.28m. 0.07x means that the max magnification ratio is very low and not suitable even for modest close-up shots.
Irix 11mm F4 has a max aperture of F4 and a minimum aperture of F22.
Irix 11mm F4's optical formula consists of 16 elements in 10 groups . Following special elements are used in this design:
- 3 aspherical
- 4 HRI
- 2 ED elements
- Neutrino coating
Irix 11mm F4 comes with a removable lens hood which is handy to reduce lens flare and glare in your photos.
Popular Comparisons of Irix 11mm F4
Here is the eight most popular comparisons of Irix 11mm F4 amongst Camera Decision readers.