Astro Drop-in Filter for Canon RF/EF Adapter

Our Kolari R Drop-in Astro Filters are engineered to enhance night sky photography by suppressing light pollution and increasing contrast in celestial objects. Designed for astrophotographers using modified or stock cameras, these filters allow for deeper exposures with less glow, helping stars and nebulae stand out against cleaner, darker backgrounds.

Kolari R Drop-in Filters for Canon EF-EOS R Lens Mount Adapter (EF/EF-S to RF) are designed with both durability and usability in mind. Each filter is machined from solid aluminum with a wide grip and a lanyard attachment point, offering lightweight strength, secure handling, and user-friendly customization. Our precision-fit attachment system applies just the right amount of pressure, making it easy to swap filters intuitively—while ensuring they stay firmly in place during use.

All Kolari R Drop-in Filters for Canon EF-EOS R Lens Mount Adapter (EF/EF-S to RF) feature advanced AR (anti-reflective) and AS (anti-smudge) coatings for improved light transmission, reduced reflections, and easy cleaning.

Nebula Booster NBZ-II Filter: 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.
IDAS GNB: Designed to transmit Hα and OIII wavelengths while effectively suppressing light pollution in the visible spectrum, similar to the IDAS NBZ. However, what sets the GNB apart from other filters on the market is its unique ability to also pass near-infrared light. This feature makes it ideal for capturing galaxies that are otherwise inaccessible with conventional nebula filters.

Note: We recommend using this filter with a full-spectrum converted camera, as normal stock cameras will not be able to transmit near-infrared light.

NGS1 (LPS-D3) Night Glow Suppression: an advanced light pollution suppression filter that performs exceptionally well in both urban and rural settings. It effectively reduces interference from both artificial lights and natural night glow, enhancing the clarity and contrast of deep-sky objects.

DTD (Dusk To Dawn): a cutting-edge light pollution filter, uniquely designed with an integrated IR transmission area. Ideal for full-spectrum cameras, the DTD filter excels in passing key wavelengths, including those in the Ha and OIII regions, as well as the bands associated with comet ion tails. This makes it a standout choice for both deep-sky and comet photography.

HEUIB-II UVIR Cut Red Corrected Hα: engineered to block unwanted wavelengths while allowing the transmission of crucial H-alpha, H-beta, and O-III lines, making it ideal for capturing emission and reflection nebulae.

Similar to our UV/IR Cut H-Alpha Pass filter used in astro modifications, the HEUIB-II features reduced excess red signal, resulting in clearer and more vibrant nebula images.

Works with:

Canon RF-mount camera bodies (e.g. EOS R, R5/R6/R7/R8/R50/RP) and RED Komodo/V-Raptor

Canon EF & EF-S lenses (mounted “behind” the adapter)

Drop-in filters from:

Kolari R series (ND, IR/UV-cut, UV-bandpass, IR-ND, etc.)

Canon’s own EF→RF drop-in filters

Meike-compatible drop-in filters

Does not work with:

RF-mount lenses (they cannot be attached through this adapter)

Standard front-mounted filters (only drop-in style filters fit the internal slot)

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.

The IDAS GNB filter is designed to transmit Hα and OIII wavelengths while effectively suppressing light pollution in the visible spectrum, similar to the IDAS NBZ. However, what sets the GNB apart from other filters on the market is its unique ability to also pass near-infrared light. This feature makes it ideal for capturing galaxies that are otherwise inaccessible with conventional nebula filters.

Note: We recommend using this filter with a full-spectrum converted camera, as normal stock cameras will not be able to transmit near-infrared light.

[caption id="attachment_160217" align="aligncenter" width="1051"] GNB Galaxy Nebula Booster Transmission Curve[/caption]

The NGS1 (LPS-D3) is an advanced light pollution suppression filter that performs exceptionally well in both urban and rural settings. It effectively reduces interference from both artificial lights and natural night glow, enhancing the clarity and contrast of deep-sky objects.

As the world’s first filter to suppress both man-made light and night glow interference in the green, orange, and red ranges—including OI (557.7nm, 630.0nm, 636.4nm) and NaI (589.0nm, 589.6nm)—the NGS1 significantly improves image quality. It is also a successor to the IDAS light pollution cut filters, making it effective against white LED lights, as well as low- and high-pressure sodium lamp pollution.

Designed to maximize the transmission of light from emission nebulae, comet comae, and ionized comet tails, the NGS1 is optimized for longer wavelengths. This shift in transmittance range allows for better performance when dealing with oblique incidences, which are common with thin-film interference filters.

When used with lenses that have an aperture of f/2 or faster, the NGS1 effectively captures nebular emission lines, improving deep-sky and cometary imaging under challenging conditions.

The Dusk to Dawn (DTD) filter is a cutting-edge light pollution filter, uniquely designed with an integrated IR transmission area. Ideal for full-spectrum cameras, the DTD filter excels in passing key wavelengths, including those in the Ha and OIII regions, as well as the bands associated with comet ion tails. This makes it a standout choice for both deep-sky and comet photography.

Not only does the DTD filter deliver the same exceptional Ha and OIII transmission as the IDAS NBZ filter, but it also provides a distinct pass band for comet ion tails within the visible spectrum (400nm to 700nm).

By enhancing contrast in the NIR region, which is minimally affected by light pollution, the DTD filter boosts the visibility of continuous spectrum light from comet dust tails, galaxies, and the Milky Way. This allows for high-contrast imaging of a wider array of celestial objects in both the visible and near-infrared spectrum.

The HEUIB-II filter is engineered to block unwanted wavelengths while allowing the transmission of crucial H-alpha, H-beta, and O-III lines, making it ideal for capturing emission and reflection nebulae.

Similar to our UV/IR Cut H-Alpha Pass filter used in astro modifications, the HEUIB-II features reduced excess red signal, resulting in clearer and more vibrant nebula images.

Optimized for capturing H-alpha nebulae at a wavelength of 656.3nm, the HEUIB-II filter minimizes interference from the red end of the spectrum, commonly seen in traditional astronomical IR-cut filters like the UIBAR-III.

This enhanced suppression of the red spectrum allows for improved contrast and detail in H-alpha nebulae images. Compared to the original HEUIB filter, the HEUIB-II offers superior red spectrum control, delivering sharper and more defined nebulae in the H-alpha region.

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 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.