Best ND Filter for Irix 15mm f/2.4
The Irix 15mm f/2.4 is a landscape photographer’s dream, but its massive 95mm front element makes finding the right ND filter a bit of a logistical headache. You don’t want to spend hundreds on a sharp, ultra-wide lens only to soften your images with mediocre glass. In my years shooting wide-angle vistas, I’ve found that the Irix Edge series offers the most seamless fit, but third-party options like NiSi and Haida provide incredible color accuracy that shouldn’t be ignored.
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Best ND Filter for Irix 15mm f/2.4: Detailed Reviews
Irix Edge ND1000 95mm View on Amazon View on B&H
If you own the Irix 15mm f/2.4, the Irix Edge ND1000 is the most logical choice. It was designed specifically for the unique 95mm thread of this lens, ensuring that vignetting is virtually non-existent despite the ultra-wide focal length. The 10-stop light reduction is perfect for turning rushing waterfalls into silky ribbons or smoothing out coastal waves. I’ve found that the color neutrality is exceptional; unlike many 10-stop filters that lean heavily into the magenta or blue spectrums, this one maintains a very natural balance thanks to its multi-layered coatings. The glass is tempered, making it surprisingly resistant to the occasional accidental bump in the field. The only minor drawback is that 95mm filters are inherently bulky to store, but that’s the price you pay for such a fast, wide lens. It’s a “set it and forget it” piece of gear that won’t let you down.
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NiSi Pro Nano HUC IR Slim ND1000 View on Amazon View on B&H
NiSi has built a massive reputation among landscape shooters, and their 95mm screw-in ND1000 is a testament to why. The “IR” in the name stands for infrared coating, which is crucial for long exposures. Without it, you often get a muddy infrared leak that turns shadows purple; you won’t see that here. The glass is high-definition optical glass that keeps the Irix 15mm’s legendary sharpness intact from corner to corner. I particularly love the Nano coating—it makes cleaning off sea spray or fingerprints incredibly easy compared to cheaper filters. While it’s slightly more expensive than some generic brands, it offers a performance-to-price ratio that is hard to beat. It’s thin enough to avoid vignetting, though you should be careful not to stack it with other filters. For photographers who want elite-level color accuracy without the “native” premium price tag, this is the one.
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Irix Edge Gelatin Filter Set View on Amazon View on B&H
Many owners forget that the Irix 15mm f/2.4 features a 29x29mm rear gelatin filter slot. This is the most affordable way to get ND functionality without buying giant 95mm glass. This set includes ND4, ND8, and ND16 filters. While you don’t get a full 10-stop reduction here, these are fantastic for shooting wide open in bright light or slightly extending shutter speeds for moving water. The primary advantage is size and cost; you can carry the whole set in your pocket. The limitation, of course, is the density—you can’t easily do 2-minute exposures in midday sun with an ND16. Additionally, installing them involves touching the rear of the lens, which requires a steady hand and a clean environment. However, if you’re on a tight budget or want to keep your kit as light as possible for long hikes, these gelatins are a stroke of genius from Irix.
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Haida M10 Filter Holder Kit View on Amazon View on B&H
For the photographer who refuses to compromise, the Haida M10 system with a 95mm adapter ring is the gold standard. What makes this premium is the drop-in ND filter design. Instead of screwing a giant piece of glass onto the front—which can cross-thread or get stuck—you simply slide a dedicated ND drop-in into the holder. This allows you to stack a circular polarizer and a 10-stop ND with zero vignetting on the Irix 15mm, a feat that is nearly impossible with standard screw-ins. The M10 holder is made of aviation-grade aluminum and feels incredibly sturdy. I’ve used this in freezing conditions in the Rockies, and the quick-release clip is a lifesaver when your fingers are numb. It is a significant investment, but if you plan on using multiple filters or want the fastest workflow in the field, the Haida M10 is worth every penny.
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B+W 95mm XS-Pro Digital ND Vario View on Amazon View on B&H
If you find yourself switching between video and stills, a variable ND can be a lifesaver. B+W is world-renowned for their Schott glass, and the XS-Pro Vario is one of the few variables that doesn’t drastically degrade image quality. On the Irix 15mm, you have to be careful with variable NDs because the wide angle can sometimes reveal the “X-pattern” at high densities. However, B+W’s engineering keeps this to a minimum. I find this filter exceptional for run-and-gun landscape video where light is changing rapidly. The 95mm version is quite large, but the build quality is tank-like. You get about 1 to 5 stops of light reduction. Just a tip: don’t push it to the absolute max setting on a 15mm lens to avoid uneven exposure. It’s a specialized tool that offers convenience that fixed filters simply can’t match.
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Buying Guide: How to Choose an ND Filter for Irix 15mm
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| Irix Edge ND1000 | Native Performance | ★★★★★ | Check |
| NiSi Pro Nano | Color Accuracy | ★★★★☆ | Check |
| Irix Gelatin Set | Budget/Lightweight | ★★★★☆ | Check |
| Haida M10 System | Pro Workflow | ★★★★★ | Check |
| B+W Vario ND | Video Work | ★★★★☆ | Check |
Frequently Asked Questions
Can I use 100mm square filters with the Irix 15mm f/2.4?
Yes, but you need a specific holder. Irix makes the IFH-100 holder, and Haida offers a 95mm adapter for their M10 system. Standard 100mm holders from other brands might vignette because of the 95mm thread size. Always check that the holder is designed for wide-angle lenses and uses a slim adapter ring to keep the glass as close to the lens element as possible.
Do the rear gelatin filters affect image quality?
Technically, any layer of material between the lens and the sensor can affect quality, but Irix’s gelatin filters are surprisingly high-quality. While they aren’t as optically perfect as high-end Schott glass, the difference is negligible for most shooters. The biggest risk is dust or fingerprints during installation, which will definitely degrade your image, so handle them with tweezers and extreme care.
Why is the Irix 15mm filter size so large (95mm)?
The 95mm thread is necessary to accommodate the large, bulbous front element while maintaining a fast f/2.4 aperture. If the thread were smaller, you would see massive vignetting at the corners of the full-frame sensor. It’s actually a benefit that Irix included a thread at all; many 15mm lenses have fixed hoods and require massive, expensive 150mm filter systems.
Is a 10-stop ND filter (ND1000) too dark for general use?
An ND1000 is specialized for long exposures. If you want to shoot in broad daylight with a 20-30 second shutter speed to blur clouds or water, you need a 10-stop. If you just want to shoot wide open at f/2.4 in the sun for a shallow depth of field, a 3-stop (ND8) or 6-stop (ND64) is usually a better choice.
How do I prevent my 95mm ND filter from getting stuck?
Large diameter filters are notorious for binding. To prevent this, never over-tighten the filter; just turn it until it stops. You can also apply a tiny amount of graphite from a pencil lead to the threads to act as a dry lubricant. If it does get stuck, use a dedicated filter wrench rather than your hands to avoid warping the thin metal frame.
Final Verdict
For most users, the **Irix Edge ND1000** is the gold standard, offering a seamless experience designed by the same engineers who built the lens. If you are a color purist, the **NiSi Pro Nano** is an incredible alternative. However, if you’re just starting out or want to keep your bag light, don’t overlook the **Irix Gelatin Set**—it’s a unique feature of this lens that provides excellent value for casual long-exposure photography.