ND Clip-in Filters For Sigma FP/BF L-Mount – Magnetic

Our Kolari Magnetic Clip-In Filters for Sigma FP/BF (L-Mount) bring precise exposure control into a compact, streamlined system built for serious shooting.

The ND filters are engineered for true color neutrality, reducing light without introducing unwanted color shifts. You can shoot wide open in bright conditions, control motion with longer shutter speeds, and maintain a consistent look across scenes without fighting your grade in post.

Mounted behind the lens, this design eliminates the need to manage multiple filter sizes across your kit. You can move between lenses without changing your filtration setup, which keeps your workflow fast and consistent whether you’re shooting handheld or on a full rig.

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 into your setup and can be paired with front-mounted filters when needed, all while preserving clean, accurate image quality.

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 – Good for slightly reducing light in bright conditions. Useful for maintaining a wide aperture to blur backgrounds or for light motion blur in water and people.

6-Stop ND – Provides moderate light reduction. Ideal for long exposures during the day to soften motion in clouds, waterfalls, or crowds without overexposing the image.

10-Stop ND – Strong light-blocking filter. Great for dramatic long exposures that smooth out water, blur skies, and remove moving elements from scenes in bright daylight.

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

Sigma FP
Sigma FP L
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.

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