The NiSi 4 x 5.65" Natural-Night Cinema Filter is designed to reduce the appearance of light pollution in video or images that include the night sky and illumination from artificial light sources. This effect can be obtained when this filter is used on a film camera system with daylight film installed, or on a digital camera system with its daylight white balance setting selected.

Light pollution occurs in areas of the night sky that are above or near concentrated and intense sources of artificial light such as cities. These light sources can include exterior and interior lamps for commercial or residential buildings, brightly lit advertisements such as billboards, streetlamps, as well as sports and entertainment venues. Together, they can result in a type of light pollution known as skyglow, where individual stars, the Milky Way, and other astronomical features in the night sky are obscured. Additionally, artificial lights clustered together can become difficult to individually discern. Light pollution from these "cluttered" sources can become a source of distraction within an image and can resemble overexposed areas of glare.

When used, the NiSi 4 x 5.65" Natural-Night Cinema Filter can improve the results of nighttime images by blocking the yellow light from sodium-vapor lamps, mercury-vapor lamps, or low Color Rendering Index LED's, common light sources within urban areas. By preventing the dominant wavelengths of light associated with the color of those lamps from being recorded, the visibility of astronomical objects is enhanced, and where they appear, artificial light sources are more clearly defined with less glare and improved contrast.

This filter is compatible with filter holders that can accommodate 4mm-thick, 4 x 5.65" rectangular filters and is constructed from optical glass for clarity as well as color fidelity. Each glass surface includes one layer of nano coating. The nano coating associated with this filter results in an improved beading effect when in contact with water or oil for greater cleaning efficiency.

A leatherette pouch is included with this filter for storage and transport.

Reduces Light Pollution in Night Sky    Blocks Yellow Sodium-Vapor Light    Blocks Yellow Mercury-Vapor Light    Blocks Yellow Light from Low CRI LED's    1.5-2.8x Filter Factor, 0.6 to 1.5 Stop    H-K9L Optical Glass Construction    Nano Coating    4mm-Thick    Leatherette Pouch

• Compatible with filter holders that can accommodate 4mm-thick, 4 x 5.65" rectangular filters
• Reduces the appearance of light pollution in video or images that include the night sky and illumination from artificial light sources
• For cameras with daylight film installed, or a digital camera system with its daylight white balance setting selected
• Blocks the yellow light from sodium-vapor lamps, mercury-vapor lamps, or low Color Rendering Index LED's, common light sources within urban areas
• Enhances the visibility of astronomical objects, and where they appear, artificial light sources are more clearly defined with less glare and improved contrast
• 1.5 to 2.8x filter factor reduces exposure by 0.6 to 1.5 stops
• Constructed from optical glass for clarity
• Each glass surface includes one layer of nano coating that results in an improved beading effect when in contact with water or oil for greater cleaning efficiency
• Leatherette pouch included for storage and transport

Related Questions and Answers

Q: 1. Will this work with the Sigma A00090 Rear Filter Holder?

A: Hi--that filter holder is only compatible with two Sigma filters; it's not compatible with this filter.

Q: 2. I saw that there is another version of this filter with an aluminum frame. What is the frame of this filter made of?

A: The NiSi 72mm Natural Night Filter ring is made out of aluminum.

Q: 3. Are you certain this will work with my Sigma 500mm f/4? That lens only takes a drop-in 46mm mounted on rear of lens.

A: Yes, the NiSi 46mm Natural Night Filter will work on the Sigma 500mm f/4 DG OS HSM Sports Lens.

Q: 4. Does it help when u shoot early morning

A: The NiSi 150 x 150mm Natural-Night Filter is designed to reduce the appearance of light pollution in images or video that include the night sky and illumination from artificial light sources, is not designed to be used for natural light unless the natural light is jammed with a lot of artificial light sources.

Q: 5. does this filter fit on the nikkor 70-300 f4.5-6.3 lens for nikon cameras?

A: The Nikon AF-P DX NIKKOR 70-300mm f/4.5-6.3G ED VR Lens uses a 58mm filter in front. The NiSi 58mm Natural Night Filter is a better choice. https://bhpho.to/3juKIAh

Q: 6. how do I know what to choose? 100x100 or 150mmx150 or 180x180mm? I don't have a holder yet either, so want to get everything to fit my 62mm ring lens and my 67mm lens ring

A: Hi--many filters will fit in a standard 100x100mm filter holder (probably the most common filter size); you need to choose among the filter holders (you will also need a compatible adapter ring for the lens you're using): https://www.bhphotovideo.com/c/search?q=filter%20holders&filters=fct_category%3Afilter_holders_3837%2Cfct_filter-system_2715%3A4in-100mm-wide-filters

Q: 7. Is this compatible with LEE Filters SW150 Mark II Filter System Holder for Wide-Angle Lenses?

A: The NiSi 150 x 150mm Natural Night Light Pollution Filter is compatible with the LEE Filters SW150 Mark II Filter System Holder for Wide-Angle Lenses.

Q: 8. What color balance is recommended for this?

A: The color balance recommended for this NiSi 46mm Natural Night Filter is "Daylight".

Q: 9. Is this compatible with Sigma 500mm f/4 rear drop-in filter holder?

A: Yes, the NiSi 46mm Natural Night Filter should work with the Sigma 500mm f/4 DG OS HSM Sports Lens.

Q: 10. does this filter pass 5577 angstroms? I wish to pass 5577 for auroral photography, but otherwise block Na 5890 & other street lamp emissions. Maybe i can get a transmission spectrum for this filter? Otherwise, can you recommend an ideal auroral/light pollution filter? thank you.

A: Unfortunately, for whatever reason NiSI does not list the angstroms for this filter. However, I would take their word that it is: Reduces Light Pollution in Night Sky, Blocks Yellow Sodium-Vapor Light, Blocks Yellow Mercury-Vapor Light, and Blocks Yellow Light from Low CRI LEDs. If it does not, they will lose customers.