IRIX 15mm f/2.4 Firefly Lens for Nikon F

IRIX 15mm f/2.4 Firefly Lens for Nikon F

IRIX 15mm f/2.4 Firefly Lens for Nikon F

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Product Highlights

  • Nikon F-Mount/FX Format
  • Aperture Range: f/2.4 to f/22
  • Two Aspherical Elements
  • Two ED and Three HR Elements
  • Neutrino Coating
  • Manual Focus Design with Focus Lock
  • Rubberized Focus Ring
  • Depth of Field and Focus Distance Scales
  • Weather-Sealed ABS Plastic Housing
  • Rounded Nine-Blade Diaphragm
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IRIX 15mm f/2.4 overview

  • 1Description

An impressively wide prime lens, the Nikon F-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 FX-format Nikon F-mount DSLRs, this lens can also be used on DX models where it provides a 22.5mm 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.

IRIX 15mm f/2.4 specs

Focal Length 15mm
Aperture Maximum: f/2.4
Minimum: f/22
Camera Mount Type Nikon F
Format Compatibility Nikon FX/35mm Film
Angle of View 110°
Minimum Focus Distance 11.02" (28 cm)
Elements/Groups 15 / 11
Diaphragm Blades 9, Rounded
Autofocus No
Filter Thread Front: 95 mm
Dimensions (DxL) Approx. 4.49 x 3.94" (114 x 100 mm)
Weight 1.28 lb (581 g)
Packaging Info
Package Weight 2.05 lb
Box Dimensions (LxWxH) 8.0 x 6.3 x 5.9"

IRIX 15mm f/2.4 reviews

15mm f/2.4 Firefly Lens for Nikon F is rated 4.1 out of 5 by 8.
Rated 4 out of 5 by from Great lens..except... Overall this is a great lens, sharp from edge to edge. However the focus confirm chip is inaccurately positioned. In Live View the focus is perfect - it matches the focus scale exactly. However, using viewfinder focusing using the Focus Confirm is way off. I have to dial in -20 on my D810 to get the focus confirm to work correctly. And unfortunately, on my D800, the -20 is not enough. The focus confirm on the D800 is still off. It's very hard to focus on distant objects through the viewfinder with this lens without focus confirm, due to the subject being so small, so this is a problem lens for my D800.
Date published: 2017-04-06
Rated 3 out of 5 by from Still on the fence... I purchased this lens based on the very few reviews I could find. I have paired this lens with my Nikon Df...I'm not completely sure it's a good match. When the lens arrived the first thing I noticed was how cheap the plastic used on the Firefly version is. The lens hood had several scuffs and scratches right out of the box, and attaching the hood to the lens also creates permanent scuff marks around the lens barrel. The white styrofoam from the tin lid insert was all over in the grooves of the focus ring and had to be carefully removed with a small make-up brush(a Giotto Rocket Blaster did not work). Disappointing but I guess you get what you pay for. This is a manual focus lens so a confirmation dot lights up through the Df viewfinder when the lens is in focus. Unfortunately, the focus ring can still be turned a good quarter turn after confirmation and still show the confirmation dot lit up. It is a very hard lens to focus accurately. The first couple of days I had this lens, my frustration with it only grew. I finally figured that if I turned the lens until the dot lit up and then added an extra slight turn, the lens is 95% spot on and produces very sharp, crisp images. The images I succeeded in getting from this lens were very nice. The sharpness is great across the frame but there is a bit of distortion at the edges. It takes beautiful sunsets when you hit your mark perfectly. I'm still on the fence as to whether I am keeping this lens. I want to make sure I give it a good chance before returning. I also purchased the magnifying eyepiece for the Df to see if that would help with focusing this lens...unfortunately it did not. One more's an odd thing to mention but when I use the lens outside in bright sunlight, the plastic on the lens gets pretty warm/hot. I have never had a lens do this. I hope this info helps in making your decision. I have added a few photos so that you can see what this lens can do.
Date published: 2017-07-09
Rated 4 out of 5 by from Great for architectural photography I bought this lens for an architectural photography project in which I was using the 20mm 1.8g for most photos, but found I could not get some shots without converging verticals. I considered a 24mm tilt shift, but it was not wide enough. The 19mm tilt shift was priced too high to be an option. I tried the Tamron 15-30mm 2.8, and, although it was fine,�at�15mm�its barrel distortion�is large and�its resolution and contrast can not match the 20mm 1.8g. The Irix 15mm solved my problems. Its image quality comes close to the 20mm 1.8g, which is saying a lot, and the barrel distortion is minimal. Those looking at reviews will notice some significant differences in analyses of image resolution from one site to the next. I found the ephotozine review to be the most accurate insofar as it is indeed at f11 that the edge image resolution is at its best. Finally a shout out to B&H. My first copy was slightly decentered. B&H exchanged it without hastle for a new copy, which is my initial tests show to be excellent.� I would give the lens five stars on the basis of performance and� price, but had to bring it down to four due to the problem with the first copy.
Date published: 2017-12-13
Rated 5 out of 5 by from A good lens at a good price point I primarily use this product for landscape astrophotograpy. It has an indented infinity position, which is fairly accurate for my uses so far, and that makes my workflow much easier. It is also a wider lens than I had before, resulting in longer exposures. I do notice some vignetting when the lens is wide open, but that can be corrected. I am quite pleased with it so far.
Date published: 2017-08-28
Rated 4 out of 5 by from IRIX Firefly 15mm f2.4 Nikon Did an interior architecture shoot this weekend with a D800. Using infinity focus and f8, I was able to get great edge to edge sharpness with little distortion and vignetting. The colour rendition was well balanced. The corrections in Lightroom were minor. Actually great Bokeh wide open on close ups. Great lens.
Date published: 2017-09-18
Rated 5 out of 5 by from Really a wonderfull lens This is a very easy lens tu use, either on FF or DX camera. The nice thing is how easy it is to be dead on the subject (or almost) by just looking at the distance scale, and after 2,5m distance, you basically are always on top of it. The lens is light and the focus ring lock is a little something nice to have for astro photography if you do it a lot and the barrel became a little loose over the years. So far not a problem after a few month of use for sure. I would say the lens have a sweet IQ right off at f2.4. At F8 it is super nice once adjusted if it needs to be. Bare in mind that you can adjust a the lens with micro adjustment. It is not easy to do and you can make it worst, but for my lens, i did it and i went from always a little behind the subject to right on it.
Date published: 2017-09-05
Rated 3 out of 5 by from Poor Astro but great landscape lens I bought this lens primarily for astrophotography. There is fair bit of sample variation with this lens. The first copy I got had very poor corners no matter what aperture I used. I ended up exchanging it for the second copy. Landscape: This is a great landscape lens. Infinity lock makes it really easy to shoot with this lens. It is sharp corner to corner on any standard landscape aperture F5.6-F11. Plus, it can take filters (though they are 95mm). Images produced are crisp and good contrast. Astrophotography: This is where it was a big let down. The aberrations (coma and others) are quite high. All fast wide lenses have some aberrations (including Nikon 14-24, Tamron 15-30) Unfortunately, for this lens aberrations appear not just in corners but closer to center as well. I had to stop down to F4 to reduce them which effectively makes it not useful. It is however really easy lens to use in night, just lock it at infinity and go. Everyone has different tolerance to aberration and this may work for you. However, looking at web samples and reviews, it appeared that it was closer to Tamron 15-30. However, it was lot worse - perhaps I needed to try yet another try. Ratings: Landscape: 5/5 Astrophotography: 2/5 In the end, I reluctantly ended up returning since my primary use case is astro.
Date published: 2017-08-24
Rated 5 out of 5 by from Nice Lens Haven't had a chance to do some serious evaluation, but so far so good. Very nice lens, and well made.
Date published: 2017-03-30
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