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IRIX 11mm f/4 Blackstone Lens for Canon EF

BH #IR11BSC • MFR #IL-11BS-EF
29 reviews
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IRIX 11mm f/4 Blackstone Lens for Canon EF
Key Features
  • Canon EF-Mount/Full-Frame Format
  • Aperture Range: f/4 to f/22
  • Three Aspherical Elements
  • Two ED and Four HR Elements
Distinguished by its refined physical construction, the 11mm f/4 Blackstone Lens from Irix is an ultra-wide prime designed for Canon EF-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.
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IRIX 11mm f/4 Blackstone Overview

From Manufacturer

Distinguished by its refined physical construction, the 11mm f/4 Blackstone Lens from Irix is an ultra-wide prime designed for Canon EF-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.

Beyond its optical assets, this 11mm f/4 lens also sports a manual focus design for fine-tuned control, and incorporates a unique positive focus lock to secure the focusing position at any point for consistent, repeatable shooting. As the Blackstone version of this focal length, this lens is also distinguished by an aluminum and magnesium alloy exterior, engraved lens markings with fluorescent UV paint for high visibility, and extensive weather-sealing about the lens to permit working in harsh environments.

The Blackstone version of the 11mm f/4 lens features a durable aluminum and magnesium alloy housing and weather-resistant exterior along with inner seals, and an extra seal at the front element, to protect against dust and moisture intrusion. The metal exterior also distinguishes itself with an anti-scratch finish, and sports engraved focus distance and depth of field scales with fluorescent UV paint for high visibility when working in low-light conditions.
Ultra wide-angle prime designed for full-frame Canon EF-mount DSLRs, this lens can also be used on APS-C models where it provides a 17.6mm equivalent focal length.
Three aspherical, four high-refractive index, and two extra-low dispersion elements are featured within the optical design to limit both spherical and chromatic aberrations, as well as color fringing and distortion, for improved clarity, sharpness, and even illumination.
A Neutrino coating has been applied to limit lens flare and ghosting for improved contrast and color fidelity.
Manual focus designed is benefitted by a positive focus lock mechanism to secure your focus position at any point to limit unwanted shifting of focus.
A hard click stop indicates the infinity position on the focus ring for easy use in low-visibility conditions.
Large depth of field scale benefits using hyperfocal and pre-focus techniques.
Built-in petal-shaped lens hood blocks stray light in order to reduce lens flare, and also protects the front element of the lens.
Rear of the lens accepts 30 x 30mm cut gel filters.
Rounded nine-blade diaphragm contributes to smooth bokeh.
Includes complimentary additional rear lens cap.

IRIX 11mm f/4 Blackstone Specs

Focal Length
11mm
Aperture
Maximum: f/4
Minimum: f/22
Lens Mount
Canon EF
Lens Format Coverage
Full-Frame
Angle of View
126°
Minimum Focus Distance
10.83" / 27.5 cm
Optical Design
16 Elements in 10 Groups
Aperture/Iris Blades
9, Rounded
Focus Type
Manual Focus
Image Stabilization
No
Filter Size
Gel Filter (Rear)
Dimensions
ø: 4.65 x L: 4.06" / ø: 118 x L: 103 mm
Weight
1.74 lb / 790 g
Packaging Info
Package Weight
3.13 lb
Box Dimensions (LxWxH)
6.8 x 5.65 x 5.6"

IRIX 11mm f/4 Blackstone Reviews

Iris Wideness

By Jon
Rated 5 out of 5
Date: 2025-06-15

Amazing lens and very sharp. I probably won't use it a lot but when I need to go really wide, I'll have the right tool in my kit.

Wonderful lens

By Dennis
Rated 5 out of 5
Date: 2022-05-12

I have been swapping lenses and have replaced all of them with the exception of this incredible ultra wide angle lens. The packaging is very unique and the lens will surely outlive me. I am using it on a Canon EOS R6 with the control ring adapter.

See any errors on this page?

Anyone using this with a c100 mkii? If so, ...

Anyone using this with a c100 mkii? If so, thoughts?
Asked by: Todd
The IRIX 11mm f/4 Blackstone Lens for Canon EF is an excellent choice for someone interested in a super wide angle rectilinear lens for the C100 Mk II Digital Cinema Camera. The rectilinear design limits image distortion and the lens uses a positive lock mechanism that will make it easier to pull focus consistently and accurately.
Answered by: jabarih
Date published: 2022-01-12

Will this work on the BMPCC4K with a Metabones ...

Will this work on the BMPCC4K with a Metabones Speedbooster (MFT to EF) ? Will there be vignetting?
Asked by: Jake
Both the 0.71 and the 0.64 Metabones Speedbooster, show little to no vignetting.
Answered by: David B
Date published: 2023-04-18

question

Can someone please explain or help me to understand how to read the hyperfocal scale on this lens? I have never had a problem using hyperfocal scales on any of my other lenses, but this one is quite perplexing to me, there are so many values on it.
Asked by: Paul R.
If you are old school and know how to use the hyperfocal scale on manual lenses, then work as you have before. If you wish, you can also use the innovative hyperfocal indication line but really it is meant for others. That is because, ever since auto focus lenses came into use, they have mostly come without manual aperture scales since they had no place for the scales to be applied. Therefore a generation of photographers has grown up not knowing what they are for or how to use them. With Irix's hyperfocal line, the new user determines what aperture they are using, moves the focus ring to line up the aperture number on the Irix hyperfocal line with the lens focus mark. Then they look to the aperture numbers on the traditional scale to see the hyperfocal distance or the area that is in acceptable focus. To old users it is not necessary, to new users it is very helpful.
Answered by: Dennis A L.
Date published: 2022-03-15

Is there an 150mm filter holder for this lens

Is there an 150mm filter holder for this lens
Asked by: Harold
Not that I know of that we sell, there may be some coming soon from Nisi, Lee, Fotodiox, etc..
Answered by: Rob
Date published: 2020-08-05

What mm size UV protective filter fits this Irix ...

What mm size UV protective filter fits this Irix 11mm Blackstone Lens?
Asked by: Ed
Due the shape of the front element on the IRIX 11mm f/4 Blackstone Lens for Canon EF, it doesn't accept screw in UV protective filters.
Answered by: Samik G
Date published: 2023-05-09

Since there is no Sony FE version, how will this ...

Since there is no Sony FE version, how will this work with a Canon EF to Sony E Metabones adapter?
Asked by: Catherine
Works well with the Metabones Canon EF/EF-S Lens to Sony E Mount T Smart Adapter (Fifth Generation).
Answered by: David B
Date published: 2023-10-22

How is the iris controlled on a Nikon F-mount ...

How is the iris controlled on a Nikon F-mount camera? Is there a 'G' style control lever? Or is it purely electronically controlled?
Asked by: Mark
The aperture is electronically controlled.
Answered by: Rob
Date published: 2021-01-11

How many degrees of rotation on the focus ring, ...

How many degrees of rotation on the focus ring, from minimum distance to infinity?
Asked by: William
The IRIX 11mm f/4 Blackstone Lens for Pentax K has a focus throw of 140 degrees when pulling from minimum focus distance to infinity.
Answered by: Elliot A
Date published: 2025-01-08
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