What Is An Irnd Filter

Kolari Vision'due south new KOLARI IRND Filter is a new jack-of-all-trades neutral density filter that's designed to perform evenly beyond both the infrared and visible light spectrums.

"Infrared photographers take a much harder time finding glass that can provide this neutral concealment effect reliably for their artistic medium when virtually of it made for visible low-cal," Kolari Vision tells PetaPixel. "That's why we decided to make an ND filter that can do both."

While there are filters marketed as "IRND filters" on the market," they're designed to cake IR light for visible low-cal photography rather than to serve as ND filters for IR photography.

"Historically the first ND filters were completely transparent in the IR spectrum," Ilija Melentijevic of Kolari Vision says. "Since NDs were used for long exposures, eventually this IR transmission would leak through and contaminate the issues. It was and then common, that people used to apply ND filters instead of an IR pass filter like the R72 so they could shoot IR.

"As this became more of a problem, companies launched the 'IRND' — basically ND filters without any IR contamination. This is typically done past just putting an IR cutting element into it, instead of making them neutral to the IR range also."

The KOLARI IRND Filter is designed to be consistently nighttime and 100% colour-neutral from 350nm all the way to 1000nm in the nigh-infrared spectrum.

"This glass is truly indifferent to whatever wavelength of light is passing through it, and because of these constraints, it actually delivers meliorate results in more traditional visual art mediums," Kolari says. "The drinking glass is fabricated to match the spectral sensitivity of a camera sensor, which includes near UV and IR, rather than simply the visible light that an [Optical Low Pass Filter] OLPF filters for.

"We remember pushing the industry in this direction will lead to more versatile optics that enable a wider range of artistic choices without sacrificing image quality or the practicality that nosotros've come to wait when shooting in the visible spectrum."

Build-wise, the IRND Filter features Corning Gorilla Glass that provides strength without thickness. It also has a lower refractive index than Schott B270 for improve sharpness.

Surrounding the glass is a thin 3.4mm brass ring that provides reduced vignetting and smoother installation than aluminum housings with less cross threading and jamming. Two-phase knurling on the edges provides grip when treatment the filter with dry easily or gloves.

On the surface of the filter are premium coatings that reduce reflectivity while helping the filter to resist water, oil, and scratches.

Here are some sample photos captured with the Kolari IRND Filter past the Kolari Vision squad (the IR photos were captured with the IRND stacked on the IRchrome filter, which recreates the look of Kodak Aerochrome):

Here are some long-exposure photos captured in visible light by photographer Greg Dubois:

The KOLARI IRND Filter is bachelor now through the Kolari Vision online store in 67mm, 77mm, and 82mm sizes with upwardly to xx stops of light reduction. The four-stop and 5-stop filters price $130 for all 3 sizes. 10-stop costs $160, 15-stop costs $170, and 20-stop costs $200. All filters come up with a lifetime warranty.