Infrared Clip-in Filter For Sigma FP/BF L-Mount – Magnetic

Our Kolari Magnetic Clip-In Filters for Sigma FP/BF (L-Mount) deliver pro-level optical performance in a compact, convenient format.

Mounted behind the lens, this system eliminates the need to buy multiple filter sizes for different lenses. Whether you’re shooting cinematic infrared, dramatic long exposures, or creative in-camera effects, you get the freedom to switch lenses without swapping filters.

Each filter is crafted from Kolari’s premium optical glass and housed in a precision CNC-machined aluminum magnetic frame. Designed for maximum lens compatibility, they integrate seamlessly with your existing setup and can even be paired with front-mounted filters for added flexibility—all while preserving outstanding image quality.

Filters marked as “Backorder” are currently out of stock but will be available again in approximately 8 weeks. To secure one from our second production run, we recommend placing your order now to guarantee availability, as stock will be limited.

We are launching Kolari Magnetic Clip-In Filters for Sigma FP and BF (L-Mount) with a limited number of units available for immediate fulfillment.

Initial orders will ship within 3–5 business days.

Once the first batch is sold through, additional orders will be fulfilled from our next production run, which is expected to ship in approximately 2 months.

Due to the limited quantity available at launch, early orders will be fulfilled on a first-come, first-served basis.

If you have any questions about current availability or timing, feel free to contact us and we’ll be happy to help.

Magnetic Mounting System – Quick and secure installation inside the camera body for effortless filter changes.

Professional-Grade Optics – Precision-crafted glass ensures minimal color shifts and maintains sharp, high-resolution imagery.

Ultra-Slim CNC-Machined Frame – A lightweight, durable aluminum design for a perfect fit without interfering with lens operation.

Premium Multi-Coatings – Anti-reflective, anti-smudge, hydrophobic, dust-resistant, and scratch-resistant coatings for superior durability.

Compatible with Multiple Lenses – Works with a wide range of lenses, ensuring flexibility across different shooting setups.

3-Stop ND – ND8 (0.9) Neutral Density Filter
6-Stop ND – ND64 (1.8) Neutral Density Filter
10-Stop ND – ND1000 (3.0) Neutral Density Filter
Mist Diffusion 1/4
Mist Diffusion 1/8
550nm Infrared***
550nm Infrared***
550nm Infrared***
550nm Infrared***
550nm Infrared***
550nm Infrared***
Blue IR/NDVI***
IR Chrome Lite***
Iridium – Color Enhancing
Clear – Dust Protective
UV/IR Cut Hot Mirror***
UV/IR Cut Hot Mirror Pro 2***
UV/IR Cut – IR Bleed Correction

***Our infrared filters will require a full-spectrum modified camera to produce the proper effect.

Our Kolari Magnetic Clip-In Filters for Sigma FP/BF (L-Mount) are compatible with the following cameras:

Sigma FP
Sigma BF

Our Kolari Magnetic Mounting Plate for Sigma FP/BF L-Mount is required to use our clip-in filters with your camera. If you’d like to purchase additional plates, click here.

Not compatible with the following lenses:

Sirui 50mm f1.6 Anamorphic
TTArtisan 75mm f2
TTArtisan 40mm f2 Lens.