This 4- to 0.5-sttop, 150 x 170mm Nano Hard-Edge Reverse-Graduated IRND Filter from NiSi is compatible with filter holders that can accommodate 2mm-thick, 150 x 170mm rectangular filters. It can be applied to darken bright skies, specifically during a sunrise or sunset, while allowing for a normal, unaffected exposure in the other regions of the image.

This filter achieves its effect with a 1.2 band of density across its center region that provides a 4-stop reduction in light from entering a lens. This band extends approximately 4mm in both vertical directions which tapers to a a 0.15 density that provides a 0.5-stop reduction in light at the edge above it. Directly below the 1.2 band of density, it tapers to clear, with a hard-edged line of transition before the clear area.

The placement of a 1.2 band of density that tapers to a density of 0.15 above it with a clear area directly below, allows the NiSi 150 x 170mm Nano Reverse-Graduated IRND 1.2 to 0.15 Filter to match the positioning of the sun when it is at, or immediately above the horizon. In such instances, the sun can appear closer to the center of an image as opposed to the upper edge, and an increase in brightness is created that is more prominent on both sides of the sun than above it. This pattern of brightness corresponds to the density pattern on the NiSi 150 x 170mm Nano Hard-Edge Reverse-Graduated IRND 1.2 to 0.15 Filter. The hard-edged line of transition in this reverse, graduated neutral density filter is useful for hard transitions between the sky and land, while the 4-stop to 0.5-stop gradation is applicable to multiple regions of brightness within the sky.

Variable 1.2 to 0.15 Optical Density    NiSi Optical Nano Coating    2mm Thick Optical Glass Construction    Reduce Exposure for Sunrises or Sunsets    Increases to Maximum Density at Center    Effect Configured for Sun at Horizon    Hard-Edged Line of Transition    Neutral Results, Visible, & IR Spectrums    Includes Leatherette Pouch

• Compatible with filter holders that can accommodate 2mm-thick, 150 x 170mm rectangular filters
• Effectively darkens bright skies, specifically during a sunrise or sunset, while allowing for a normal, unaffected exposure in the other regions of the image
• 4-stop band of density that tapers to a 0.5-stop density at the edge above it while directly above a clear area creates a neutral density pattern that matches the positioning of the sun when it is at, or immediately above the horizon
• 4-stop band of density extends approximately 4mm in both vertical directions
• Density pattern corresponds to the brightness pattern of the sun when it appears at or is closer to the horizon as opposed to a higher angle, which creates an increase in brightness that is more prominent on both sides of the sun than above it
• Hard-edged line of transition between the 4-stop band of density and the clear area below it is useful for hard transitions between the sky and land
• 4-stop to 0.5-stop gradation is applicable to multiple regions of brightness within the sky
• Filter does not affect the overall coloration of the image
• Each surface includes one layer of NiSi Optical Nano Coating that attenuates infrared light as well as visible wavelengths, to maintain color neutrality and suppress color casts due to increased exposure times
• Nano coating provides an improved beading effect with water or oil for more efficient cleaning
• Constructed from optical glass for clarity
• Leatherette pouch included for storage and transport

Related Questions and Answers

Q: 1. Could this be used for video? We are hoping to use a Canon XF105 to livestream the upcoming solar eclipse.

A: Yes, the NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter can be used for video as well as photography.

Q: 2. Will this filter work with my Sony 14mm F1.8 GM lens? I think I need the threading on the outside of the filter

A: The NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter (82mm, 16.5-Stop) is incompatible with the Sony FE 14mm f/1.8 GM Lens. Instead, get the NiSi 100mm Filter Holder for Sony FE 14mm f/1.8 GM Lens, B&H # NIP100SONY14, and the NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter (100 x 100mm, 16.5-Stop), B&H # NIP100ND50.

Q: 3. Can I use this for timelapse photography of the sun? (For example, shooting the sun over the four hours of an eclipse)

A: Yes, the NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter (77mm, 16.5-Stop) can be used for a long term time lapse of the sun. Just don't look at the optical viewfinder on the camera. Use the LCD live view to compose.

Q: 4. Can this be safely used for photographing a Solar Eclipse?

A: I would recommend 17 stops or more for solar eclipse, so I wouldn't recommend the K&F Concept Nano-X Series ND32000 ND Filter (100 x 100mm, 15-Stop) for solar eclipse.

Q: 5. I wish to use this filter to view the total solar eclipse. Is it good for that?

A: No, the NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter (58mm, 16.5-Stop) is not designed for solar eclipse.

Q: 6. Aside from solar photography, will I be able to use this filter as an ND filter for long exposure photography?

A: The Solar Filter Pro Nano UV/IR Cut ND100000 Filter (77mm, 16.5-Stop) allows 1/16.5th of the available light into the camera's sensor so you can use this as a ND filter for long exposure photography as well.

Q: 7. Is this filter compliant with ISO 12312-2 (the international safety standard for filters for direct viewing of the Sun)?

A: ISO 12312-2:2015 is the standard for direct viewing of the sun; the NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter (77mm, 16.5-Stop) specifically states that "This filter is not appropriate for direct solar observation with the naked eye, and should exclusively be used for photographic purposes." This filter is not rated for direct viewing of the sun.

Q: 8. Which solar filter is for the Nikon 400 mirrorless lens?

A: The Nikon NIKKOR Z 400mm f/2.8 TC VR S Lens can use the Tiffen Solar ND Filter (46mm, 16-Stop), B&H # TI46ND48. Note, it is not ISO 12312-2 certified. It should not be used to look directly at the sun with our eyes. It can be used for the camera to take a photo of the sun. Look only in the LCD live view to compose the photo. Do not look in an optical viewfinder.

Q: 9. How much reduction in UV and IR spectrum, respectively, is specified? I understand the reduction in visible light is 16.5 stops.

A: Unfortunately, Nisi does not specify how much of the IR and UV is reduced for NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter (77mm, 16.5-Stop). They do state that the UV and IR cut is to offer a color neutral result. Therefore the UV and IR cut should not be relied upon for anything else other than offering an image that is color neutral.

Q: 10. Will this filter give the sun a more white color or a yellowish color?

A: The NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter will produce a near white image of the sun. The yellow/orange that you see in some of the sample photos was added by the users in post.