Best UV Filter for Irix 15mm f/2.4 Firefly
Finding a quality UV filter for the Irix 15mm f/2.4 Firefly is a unique challenge because of its massive 95mm front filter thread. Many photographers worry about losing that legendary Irix sharpness or introduced vignetting on such a wide-angle lens. After testing several options in the field, I’ve found that the Irix Edge UV & Protector is the clear winner for its seamless integration. In this guide, I’ll break down the best glass to protect your wide-angle investment without compromising image quality.
Our Top Picks at a Glance
Best UV Filter for Irix 15mm f/2.4 Firefly: Detailed Reviews
Irix Edge UV & Protector 95mm View on Amazon View on B&H
When you’re shooting with a lens as specialized as the Irix 15mm f/2.4, it makes sense to stay within the ecosystem. The Irix Edge UV & Protector isn’t just a generic piece of glass; it’s designed specifically for the Firefly and Blackstone series. I’ve found that the ultra-slim frame is essential here—at 15mm, even a slightly thick filter ring will cause dark corners in your raw files. This filter uses high-quality optical glass with a 99.6% light transmission rate, ensuring your landscapes stay punchy and flare-free. The “SR” designation means it has an extra-hardened coating that repels water and oil, which is a lifesaver when you’re shooting near waterfalls or in dusty environments. It fits the 95mm thread perfectly and allows the original Irix lens cap to snap on securely, which is a common frustration with third-party filters. It’s the most logical choice for maintaining the lens’s weather-sealed integrity.
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Hoya 95mm Fusion One Next UV View on Amazon View on B&H
Hoya has always been my go-to for finding that “sweet spot” between professional performance and consumer pricing. The Fusion One Next series is the successor to their famous Pro1 Digital line, and in the 95mm size, it offers fantastic value. On the Irix 15mm, you’ll notice that the color neutrality is spot on—there’s no nasty yellow or blue cast that you sometimes see with cheaper UV glass. It features an 18-layer multi-coating that makes cleaning fingerprints or rain droplets significantly easier than basic filters. While it’s quite slim, it feels robust in the hand. The only minor drawback I’ve noticed is that in extremely harsh, direct backlight, it might show a tiny bit more ghosting than the Irix Edge, but for 90% of shooting scenarios, it’s indistinguishable. If you want top-tier Japanese glass without the “premium” tax, this is the one to grab for your kit bag.
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Urth 95mm UV Filter (Plus+) View on Amazon View on B&H
Let’s be honest: 95mm filters are expensive because of the sheer amount of glass required. If you’ve just spent your savings on the Irix 15mm Firefly and need reliable protection without breaking the bank, Urth (formerly Gobe) is an excellent choice. Their “Plus+” range uses professional-grade SCHOTT glass, which is surprising at this price point. In my testing, it maintains sharpness across the frame, though you might see a slight increase in flare when shooting directly into the sun compared to the B+W or Irix options. The build quality is impressive, with a magnalium rim that’s thin enough to avoid vignetting at the 15mm focal length. It also comes in a very cool, eco-friendly metal tin. While it lacks the advanced “nanoproof” coatings of higher-end models—meaning it’s a bit harder to wipe clean if you get a smudge on it—it provides excellent physical protection for the bulbous front element of the Firefly.
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B+W 95mm 010 UV-Haze MRC Nano (T-PRO) View on Amazon View on B&H
If you want the absolute best German engineering for your Irix lens, B+W is the gold standard. The T-PRO line features a unique titanium-finish brass mount that is incredibly durable and less likely to “bind” or get stuck on your lens threads than aluminum filters. This is particularly important with a large 95mm thread where cross-threading could be a costly mistake. The MRC Nano coating is legendary; I’ve literally watched water beads roll off this glass without leaving a trace. It’s ultra-thin, ensuring that you won’t see any vignetting even at f/2.4 on a full-frame sensor. You’re paying for peace of mind here—it’s essentially “invisible” glass that protects your lens from impacts and the elements. It is the most expensive option on our list, but if you’re shooting professional architecture or landscapes where every bit of micro-contrast matters, the investment is absolutely justified.
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NiSi 95mm PRO Protective UV Filter View on Amazon View on B&H
NiSi has quickly become a favorite in the landscape photography community, and their 95mm UV filter is a testament to why. What I love about this filter is the extremely slim 5.2mm frame. Even on the ultra-wide Irix 15mm, there is zero risk of mechanical vignetting. It’s built with high-quality optical glass and features a multi-coating that is both waterproof and oil-resistant. I’ve used NiSi filters in coastal environments, and they handle sea spray remarkably well—a quick wipe with a microfiber cloth and you’re back to shooting. The knurled edges on the frame are a nice touch, making it easy to grip even if you’re wearing gloves. It’s a very competitive alternative to Hoya and Irix, offering a premium feel at a mid-range price. If you already use NiSi’s square filter system, adding this to your kit is a no-brainer for daily lens protection.
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Buying Guide: How to Choose a UV Filter for Irix 15mm
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| Irix Edge UV | OEM Integration | ★★★★★ | Check |
| Hoya Fusion One | Value/Performance | ★★★★☆ | Check |
| Urth Plus+ | Budget Protection | ★★★★☆ | Check |
| B+W T-PRO | Professional Use | ★★★★★ | Check |
| NiSi PRO | Landscape Work | ★★★★☆ | Check |
Frequently Asked Questions
Will a 95mm UV filter cause vignetting on the Irix 15mm?
If you use an “ultra-slim” filter, you will not experience any mechanical vignetting. The Irix 15mm was designed with a large 95mm thread specifically to allow for filters without cutting into the corners of the image. However, stacking multiple filters (like a UV plus a CPL) will almost certainly cause dark corners, so I recommend using only one at a time.
Is there a difference between Firefly and Blackstone filter sizes?
No, both the Irix 15mm f/2.4 Firefly and the Blackstone versions share the exact same optical design and front housing. Both lenses require a 95mm screw-in filter. The only differences between the two lenses are the outer casing materials and weather-sealing levels, but the filter thread remains identical across both models.
Do I really need a UV filter for landscape photography?
While modern digital sensors have built-in UV cut filters, a UV/Protector filter is vital for physical protection. When shooting landscapes with the Irix 15mm, you are often close to the ground, rocks, or salt spray. It is much cheaper and easier to replace a $100 filter than it is to repair a scratched or damaged 95mm front element on your lens.
Can I still use the Irix lens hood with these filters?
Yes, all the filters recommended here are slim enough to allow the petal-shaped Irix lens hood to be mounted and removed without interference. The Irix Edge filter is particularly good for this as it was tested by the manufacturer for this exact scenario. Just ensure you screw the filter on completely before attaching the hood.
How do I clean a 95mm filter without leaving streaks?
Because of the large surface area, streaks are more visible. I recommend using a dedicated lens cleaning solution (like Zeiss) and a fresh microfiber cloth. Start from the center and wipe in a circular motion toward the edges. Filters with “Nano” coatings, like the B+W or Irix Edge, are significantly easier to clean as they resist oil and smudges.
Final Verdict
If you want the most reliable experience, stick with the **Irix Edge UV**; it’s designed by the same engineers who built your lens. For those who want the best possible glass regardless of cost, the **B+W T-PRO** is an heirloom-quality choice. However, if you’re a hobbyist looking for great protection without overspending, the **Hoya Fusion One Next** offers the perfect balance of clarity and value for your 15mm wide-angle adventures.