Astro Clip-in Filter For Fujifilm X-Mount – Magnetic

Our Kolari Magnetic Clip-in Filters for Fujifilm X-Mount (Astro) provide several options to help enhance your Astrophotography images. 

Crafted with the premium optical glass we’re known for, our Kolari Magnetic Clip-in Filters for Fujifilm X-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 Fujifilm X-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.

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.

This filter will require a full-spectrum-modified camera to produce the proper astrophotography effect.

The cameras below have a deep style mount meaning they have full compatibility, and will work with standard and slim filter versions with all lenses we’ve tested so far:

Full Compatibility: X-T3 / X-T4 / X-T5 / X-S10 / X-S20 / X-H1 / X-H2 / X-H2S

The cameras below have a shallow-style mount, meaning they have partial compatibility with standard and slim-style filters, depending on the lens. We recommend slim filters to maximize compatibility, although some lenses may still not be compatible.

Partial Compatibility: X-T1 / X-T2 / X-T20 / X-E2 / X-Pro 3 / X-E3

If you have one of these cameras, please refer to our lens compatibility list here to see which specific combinations will work:

If your camera isn’t listed here, unfortunately, we do not yet have lens/clip-in data available yet, and we cannot guarantee that the lens, body, and filter combination will work.

We understand that Astrophotography can be challenging, but don’t worry, we have many resources and tutorials available for astrophotographers.

Here are a few of our most popular tips and tricks below:

Choosing a Full Spectrum or H-alpha Conversion for Astrophotography

Packing for Wilderness Backpacking for Astro and Infrared Photography

Narrowband Hydrogen Alpha Filters for Landscape Astrophotography

Choosing a Camera Brand for Astrophotography

Astrophotography thoroughly tests the optics of any camera system and lens. Ultrawide lenses are particularly challenging because of the high rear incidence angles involved where any additional glass has the possibility of inducing a field curvature which can cause loss of corner sharpness on a lens-by-lens basis; this effect is most noticeable at wide apertures. While this should always be a consideration with any ultra wide lens, we typically only see issues with astrophotography where the target subject is a series of geometrically perfect points of light at infinity, shot at wide apertures.