Lens Summary
Brand: Irix
Also Known As: Irix 11mm f/4
Lens Type: Prime Lens
Format: Full Frame / FX
Focus: Manual Focus
Lens Mount: Nikon F, Canon EF, Pentax K
Release Date: 2017-03-02
MSRP Price: $774.95
Made in: South Korea
Production Status: In Production
Lens Description: Distinguished by its refined physical construction, the 11mm f/4 Blackstone Lens from Irix is an ultra-wide prime designed for Nikon F-mount DSLRs. As a rectilinear lens, the advanced optical layout makes use of aspherical, extra-low dispersion, and high-refractive index elements to control distortion and aberrations for accurate, and sharp rendering with a high degree of clarity and color accuracy. Additionally, a Neutrino coating has also been applied to the lens to control flare and ghosting for improved contrast when working in strong lighting conditions.
Photography Life Review Summary: Anybody buying this lens should know that this is a manual-focus-only lens. In this ultra-wide spectrum, it is not such a problem – Irix offers a well-designed manual focus ring with hyperfocal scale, focus lock and focus snap at infinity. The Irix 11mm f/4 is a lens for rather special purposes and I do not recommend starting with it to anyone who has not photographed with an ultra wide-angle lens yet. Creative and advanced photographers looking for new tools and perspectives may feel attracted to this lens though, so I would certainly recommend them to look into this offering from Irix. Read the full IRIX 11mm f/4 Blackstone Review by Photography Life.
IRIX 11mm f/4 Blackstone Specifications
| Lens Specifications | |
|---|---|
| Lens Type | Prime Lens |
| Focal Length | 11mm |
| Mount Type | Nikon F, Canon EF, Pentax K |
| Format | Full Frame / FX |
| Compatible Format(s) | Full Frame / APS-C |
| Compatible with Teleconverters | No |
| Image Stabilization | No |
| Aperture Information | |
| Aperture Ring | No |
| Maximum Aperture | f/4 |
| Minimum Aperture | f/22 |
| Maximum Angle of View (Full Frame format) | 126° |
| Optical Information | |
| Lens Elements | 16 |
| Lens Groups | 10 |
| Diaphragm Blades | 9 (Rounded) |
| Extra-Low Dispersion Glass Elements | 2 |
| Special Glass Elements | Four HR Elements |
| Aspherical Elements | 3 |
| Nano Coating | Yes |
| Anti-Reflective Coating | No |
| Focus Information | |
| Focus | Manual Focus |
| Built-in Focus Motor | No |
| Silent Wave / UltraSonic Motor | No |
| Minimum Focus Distance | 10.83" (27.5 cm) |
| Filter Information | |
| Filter Size | N/A |
| Accepts Filter Type | N/A |
| Physical Characteristics | |
| Weather / Dust Sealing | Yes |
| Mount Material | Metal |
| Tripod Collar | No |
| Dimensions | 4.65 x 4.06" (118 x 103 mm) |
| Weight | 1.74 lb (790 g) |
| Other Information | |
| Available in Colors | Black |
Lens Construction
MTF Chart
Distortion
Sample Images
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