Best Filter Holder for IRIX 15mm f/2.4 Lens
Finding a filter holder for the Irix 15mm f/2.4 can be a nightmare due to its massive 95mm front thread and ultra-wide field of view. Most standard 100mm systems simply won’t fit or will cause heavy vignetting that ruins your landscapes. After testing various setups on both the Firefly and Blackstone versions, I’ve found that the Irix Edge IFH-100-PRO is the definitive solution, balancing portability with professional-grade light sealing to help you capture perfect long exposures.
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Best Filter Holder for IRIX 15mm f/2.4 Lens: Detailed Reviews
Irix Edge IFH-100-PRO View on Amazon View on B&H
The Irix Edge IFH-100-PRO is specifically engineered to solve the 95mm thread dilemma. Most 100mm holders require bulky adapters that push the filter too far forward, but this dedicated unit maintains a slim profile to prevent corner shading. I’ve found the built-in circular polarizer (CPL) control is incredibly smooth; you can rotate it via a small wheel without disturbing your ND filters. It holds two 100mm square filters simultaneously, which is perfect for stacking a 10-stop ND with a graduated filter for sunrise shoots. The build is a lightweight aluminum alloy that feels rugged enough for alpine environments. My only gripe is that the proprietary adapter is mandatory, but once it’s locked onto your 15mm f/2.4, the stability is unmatched. It’s the most elegant “native” feeling solution available for this specific lens.
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Haida M10 Filter Holder View on Amazon View on B&H
The Haida M10 is a revelation for anyone tired of screwing in round polarizers. Its “drop-in” design allows you to slide a circular polarizer or a specialized ND filter into a dedicated slot behind the main square filter stages. For the Irix 15mm, you will need the specific 95mm adapter ring, which is sold separately or in certain kits. I love how fast this system is; if the light changes suddenly, you can swap the drop-in ND in seconds without touching your graduated filters. While it’s slightly bulkier than the Irix native holder, it offers more flexibility if you own other lenses with smaller diameters. You might see a tiny hint of vignetting if the holder isn’t perfectly squared, but for the price and the ingenious drop-in mechanism, it’s easily the best value for a serious landscape kit.
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NiSi 100mm V7 System View on Amazon View on B&H
NiSi has dominated the filter market recently, and the V7 is their most refined 100mm holder yet. While not the absolute cheapest on the market, it provides professional features—like the “True Color” CPL that prevents yellow casting—at a much lower entry point than premium 150mm systems. To use this with the Irix 15mm, you’ll need the NiSi 95mm adapter ring. The aluminum construction is top-notch, and the snap-on design is very secure. You should be aware that at 15mm on a full-frame sensor, you must ensure the holder is perfectly level to avoid seeing the edges of the filter slots. It’s a fantastic entry-level professional tool that grows with your lens collection, though it lacks the custom-tailored slimness of the Irix-branded holder. Still, for the price of the kit which includes the CPL, it’s a steal.
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Kase K150P Holder View on Amazon View on B&H
If you absolutely cannot tolerate even a pixel of vignetting, the Kase K150P is the nuclear option. By jumping from the 100mm standard to 150mm filters, you’re placing a massive piece of glass in front of the lens that is physically impossible for the lens to “see” the edges of. The K150P is a masterpiece of engineering, featuring a magnetic circular polarizer that snaps into the back of the holder. This allows you to rotate the CPL independently of your square ND filters. It’s significantly larger and more expensive than 100mm systems, and the filters themselves will cost more. However, the peace of mind you get when shooting ultra-wide landscapes at f/2.4 is worth the investment for working pros. It’s bulky in the bag, but on the tripod, it’s the most robust and optically “invisible” system I’ve ever used with the Irix 15mm.
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Lee Filters SW150 Mark II View on Amazon View on B&H
Lee Filters has been the industry standard for decades, and the SW150 Mark II is their answer for ultra-wide lenses like the Irix 15mm. It’s a 150mm system, which, like the Kase, ensures zero vignetting. The build quality is legendary, and the light-sealing gaskets are the best in the business—crucial for those 5-minute long exposures where light leak can ruin a shot. However, the system is quite cumbersome to mount compared to the modern magnetic or drop-in designs of NiSi or Haida. You’ll need the specific SW150 adapter for 95mm threads. If you already have a drawer full of Lee 150mm glass, this is the logical choice. If you’re starting from scratch, you might find the newer systems more user-friendly, but you can never go wrong with the color neutrality and reliability of Lee glass.
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Buying Guide: How to Choose a Filter Holder for Irix 15mm f/2.4
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| Irix Edge IFH-100-PRO | Seamless Irix Integration | ★★★★★ | Check |
| Haida M10 | Speed and Versatility | ★★★★☆ | Check |
| NiSi V7 100mm | Complete Starter Kit | ★★★★☆ | Check |
| Kase K150P | Zero-Vignette Pros | ★★★★★ | Check |
| Lee SW150 II | Legacy Reliability | ★★★★☆ | Check |
Frequently Asked Questions
Will a standard 100mm holder vignette on the Irix 15mm?
Yes, many generic 100mm holders will show vignetting at 15mm because the 95mm thread is so large. The holder’s outer frame often creeps into the corners of the image. To avoid this, you need a system like the Irix Edge IFH-100-PRO, which is specifically designed to be ultra-slim, or a larger 150mm system that moves the frame of the holder far outside the lens’s field of view.
Can I use the rear gelatin filters instead of a front holder?
You can, but there are trade-offs. The Irix 15mm has a slot at the rear for small gelatin filters. While this is a very cheap way to add ND, you cannot use graduated filters (to darken only the sky) or polarizers this way. Furthermore, gelatin filters can slightly degrade sharpness and are prone to dust. For professional results, a front-mounted square filter system is always superior.
Do I need a special adapter for the Firefly vs. Blackstone versions?
No, both the Firefly and Blackstone versions of the Irix 15mm f/2.4 share the exact same 95mm front filter thread. Any holder that fits one will fit the other perfectly. The main difference between the lenses is the outer housing material and weather sealing, but the optical dimensions and the filter thread location are identical across both models.
How many filters can I stack without vignetting?
On the Irix Edge IFH-100-PRO, you can usually stack two 100mm filters plus the integrated CPL without seeing the edges. However, if you use a standard 100mm holder with three slots, you will almost certainly see the third slot in your corners. If you frequently need to stack three or more filters for complex landscape exposures, I highly recommend moving up to a 150mm system.
Is a circular polarizer effective at 15mm?
Polarizers on ultra-wide lenses can be tricky. Because the lens sees such a wide angle of the sky, the polarization effect will not be uniform, often resulting in a dark “band” in the blue sky. This isn’t a fault of the filter, but rather physics. I find it most useful at 15mm for cutting reflections on water or wet rocks rather than darkening the entire sky.
Final Verdict
If you want the most seamless experience with your Irix 15mm f/2.4, the Irix Edge IFH-100-PRO is the clear winner; it’s designed by the same engineers and handles the 95mm thread with zero fuss. For those on a budget who still want professional results, the NiSi V7 is an excellent alternative. However, if you are a professional landscape photographer who refuses to compromise on vignetting, investing in the Kase K150P system is the ultimate path to optical perfection.