IRIX 15mm f/2.4 Firefly Lens for Canon EF

BH #IR15FFC • MFR #IL-15FF-EF
IRIX
IRIX 15mm f/2.4 Firefly Lens for Canon EF
Key Features
  • Canon EF-Mount/Full-Frame Format
  • Aperture Range: f/2.4 to f/22
  • Two Aspherical Elements
  • Two ED and Three HR Elements
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An impressively wide prime lens, the Canon EF-mount 15mm f/2.4 Firefly Lens from Irix meshes an advanced optical design with a lightweight, durable physical construction. The expansive field of view is complemented by a sophisticated optical layout that utilizes low dispersion, aspherical, and high-refractive glass elements, as well as a Neutrino coating, to render imagery with low distortion, controlled spherical and chromatic aberrations, high contrast, and natural color rendering.
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IRIX 15mm f/2.4 Firefly Overview

An impressively wide prime lens, the Canon EF-mount 15mm f/2.4 Firefly Lens from Irix meshes an advanced optical design with a lightweight, durable physical construction. The expansive field of view is complemented by a sophisticated optical layout that utilizes low dispersion, aspherical, and high-refractive glass elements, as well as a Neutrino coating, to render imagery with low distortion, controlled spherical and chromatic aberrations, high contrast, and natural color rendering.

In addition to the imaging performance, this 15mm f/2.4 utilizes 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 Firefly version of this focal length, this lens is also distinguished by a lightweight ABS plastic exterior, printed lens markings, and weather-sealing about the lens housing to permit working in trying environmental conditions.

The Firefly version of the 15mm f/2.4 lens features a lightweight ABS plastic exterior construction that is sealed against moisture and dust along the main body of the lens. The Firefly construction also incorporates a rubber focus ring for improved grip and control, and has printed focus distance and depth of field scales to aid working with pre-focusing and hyperfocal focusing techniques.
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 24mm equivalent focal length.
Two aspherical, three 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.
Front of lens has 95mm-diameter filter threads and the rear of the lens accepts 30 x 30mm cut gel filters to lessen the likelihood of vignetting.
Rounded nine-blade diaphragm contributes to smooth bokeh.
Includes complimentary additional rear lens cap.

IRIX 15mm f/2.4 Firefly Specs

Focal Length15mm
Maximum Aperturef/2.4
Minimum Aperturef/22
Lens MountCanon EF
Format CompatibilityFull-Frame
Angle of View110°
Minimum Focus Distance11.02" / 28 cm
Optical Design15 Elements in 11 Groups
Diaphragm Blades9, Rounded
Focus TypeManual Focus
Image StabilizationNone
Filter Size95 mm (Front)
Gel Filter (Rear)
Dimensions (ø x L)4.49 x 3.94" / 114 x 100 mm
Weight1.28 lb / 581 g
Packaging Info
Package Weight2.555 lb
Box Dimensions (LxWxH)6.75 x 5.65 x 5.6"
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YOUR RECENTLY VIEWED ITEMS

Hi, I use this lens with a canon EOS RP and the ...

Hi, I use this lens with a canon EOS RP and the EF adaptor. Why is the lens doesn't go down to 2.4, and get stuck at 2.5?
Asked by: Nicolas
I have similar setup (EOS r) and see same but I do not find the lens is “stuck”. When canon reports it at f2.5, the lens is wide open. And IRIX rates this lens at f2.4 which is a mathematical result of focal length and aperture diameter. Canon reports f stop numbers in 1/3 increments (typical setup). 2.5 is 2/3 of stop between f2 and 2.8. This is same on all Canon EOS camera.
Answered by: David
Date published: 2021-03-24

For the Pentax mount version, will it work with a ...

For the Pentax mount version, will it work with a film Pentax camera like the ZX-5n which has Av and Tv settings or the fully manual K1000 SE? I understand that there is no aperture ring so I would not be able to select the aperture on a fully manual camera like the K1000 and the aperture would default to 22 which would be fine for my intended purpose (landscape photography with a large DoF mounted on a tripod). Was wanting this to use with a K-1 Mk II special for night sky astrophotography landscapes and also be able to use it with my old ZX-5n and a K1000 SE for daytime landscapes. I already have a 95mm night sky light pollution filter - which is why I would prefer this lens over the Roki 14mm 2.8 which won’t accept filters but does have an aperture ring and would likely work fine on my film camera.
Asked by: Roy
It will mount to the older Pentax film cameras.
Answered by: Patrick
Date published: 2020-07-09

¿Funcionará esta lente con la Canon EOS 800D?

¿Funcionará esta lente con la Canon EOS 800D?
Asked by: Victor
Este lente si es compatible con su camara EOS 800D (T7i)
Answered by: Luz
Date published: 2020-05-06

Does this lens work on Nikon Z6?

Does this lens work on Nikon Z6?
Asked by: Wassim
I contacted IRIX with your inquiry. They replied that the compatibility of IRIX lenses with Nikon Z cameras (with FZ adapter) has been announced on their Instagram account on October 2018. They state that there are no issues with using IRIX lenses with the Nikon Z cameras using the FTZ lens mount adapter, so you should have no issues using the IRIX 15mm f/2.4 Firefly Lens for Nikon F on the Nikon Z-series Mirrorless Digital Cameras with the FTZ Lens Mount Adapter. The lens' focal length and aperture information will also be transmitted to the camera's EXIF data, along with exposure settings. That being said, do note that this is a manual focus lens, so you will still have to focus the lens manually when using the Nikon FTZ Lens Adapter.
Answered by: Manzell
Date published: 2019-04-06

question

Does the irix 15 have a focus confirmation chip for Nikon?
Asked by: Christopher S.
Yes, the Firefly has a focus confirmation chip for Nikon.
Answered by: Toru F.
Date published: 2018-08-27

question

Does this lens have an aperture ring that can be turned by hand?
Asked by: Matthew
Happy to help. I bought the Irix Blackstone 15 mm f2.4 for Nikon, but I believe the Blackstone is the same as the Firefly. No there is NOT an aperture ring to turn. The aperture and shutter speed are set as one likes in manual mode, by twisting dials on the body of the camera. Of course the focus ring on the lens itself can be turned by hand. Best wishes.
Answered by: Paul H.
Date published: 2019-05-25

question

Will this lens work fine with my Sony FS7 using my Metabones MK IV, and Metebones Speedbooster Ultra EF to E-mount adapters?
Asked by: Richard S.
Works fine with mine.
Answered by: Richard S.
Date published: 2019-01-29

question

can this be adapted to a sony mirrorless with a dumb adapter? will this work with an adapter that has aperture control ring?
Asked by: Spiros G.
I adapted it to my Sony A7RII with no issues. Loving the performance. I used smart adapter though as the aperture is controlled automatically through electronic control. You can buy one of the cheap ones that cost around $50. I used the Canon EF version.
Answered by: Justin S.
Date published: 2018-08-27
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