Astro Clip-in Filter For Sigma FP/BF L-Mount – Magnetic (Preorder)

Our Kolari Astro Clip-in Filters for Sigma FP/BF L-Mount (Astro) provide several filter options to help enhance your Astrophotography images. Engineered with Kolari’s professional-level optics, these filters are available in three options: UV/IR Cut H Alpha Pass, Light Pollution Filter, and IDAS NBZ-II.

Crafted with the premium optical glass we’re known for, our Kolari Magnetic Clip-in Filters for Sigma FP/BF L-Mount are finished with advanced anti-reflective and anti-smudge hard coatings to boost light transmission and reduce flares and ghosting. These multi-coated filters are also hydrophobic, dust-resistant, and scratch-resistant, making them easy to clean and built to withstand the demands of any shooting environment.

Each filter is housed in a precision CNC-machined aluminum magnetic frame designed for Sigma FP/BF L-mount cameras. This rear-mounted solution works seamlessly with lenses that lack front filter threads and can also be paired with external lens filters, allowing for flexible, multi-layered filtration setups.

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.

Our Kolari Magnetic Clip-In Filters for Panasonic Lumix (L-Mount) are compatible with the following cameras:

Sigma FP
Sigma FPL
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.

Our Light Pollution Filter is designed to enhance night sky photography by selectively blocking the most common wavelengths emitted by artificial lighting, such as streetlights, mercury vapor, and sodium lamps. By reducing this unwanted glow, the filter helps restore natural contrast to the night sky, making stars, nebulae, and other celestial objects stand out with greater clarity.

Perfect for astrophotographers shooting in urban or suburban environments, this filter enables deeper exposures, improved color balance, and more defined detail in your images.

This filter is compatible with both stock and full-spectrum cameras.

Our UV/IR Cut Filter (H-Alpha Pass) is specially designed for astrophotographers using full-spectrum converted cameras. It blocks unwanted ultraviolet and infrared light while allowing critical emission lines—specifically H-alpha (656nm) and Sulfur II (672nm)—to pass through, making it ideal for capturing deep-sky objects like nebulae with enhanced clarity and detail.

With a similar transmission profile to our standard UV/IR Cut Hot Mirror, this version offers an expanded spectral window tailored for emission line imaging. When paired with a full-spectrum modified camera, it delivers over 4× greater sensitivity to the H-alpha line and more than 6× greater sensitivity to Sulfur II compared to an unmodified stock camera. This dramatic boost in signal allows for shorter exposures, finer details, and better contrast in faint astronomical targets.

While designed with astrophotography in mind, this filter is also effective at minimizing IR contamination when used with stock unconverted cameras that experience residual IR leakage.

The Nebula Booster NBZ-II is a specialized filter designed to enhance deep-sky imaging. With a 10nm H-alpha narrowband and an 8nm OIII narrowband, this filter provides superior contrast and detail for capturing nebulae and galaxies.

Unlike competitive 7nm or narrower filters that lose significant transmittance in fast optical systems (around F2), the NBZ-II maintains 80% or more transmittance under the same conditions.