The 4-stop, 150 x 170mm NiSi Nano Medium-Edge Graduated IRND Filter is a rectangular filter that helps to darken specific areas of an image such as bright skies, while allowing for a normal, unaffected exposure in the other regions of the image. The filter is densest at the edge and tapers to clear by the middle, with a medium-edged line of transition between the dense and clear areas. A neutral density filter with a medium-edged line of transition can filter the sky while minimizing its effect on the land. It is particularly useful for images that include elements like rooftops and mountains that protrude into the sky. Neutral density filters do not affect the coloration of the image and this filter provides up to a 4-stop reduction in light from entering the lens.

The design of this filter has been optimized for use with digital sensors and to promote nearly flat attenuation of visible and infrared light. Due to imaging sensors' greater susceptibility to infrared light compared to traditional film, color casts can occur when photographing darker subjects that require increased exposure times. To provide neutrality across the visible and infrared spectrums in order to eliminate color casts and ensure cleaner, truer blacks, one layer of NiSi Optical Nano Coating is applied to each of this filter's surfaces. The Nano coating associated with this filter also results in an improved beading effect when in contact with water or oil for greater cleaning efficiency.

This NiSi 150 x 170mm Nano Medium-Edge Graduated IRND 1.2 Filter is constructed from optical glass for clarity as well as color fidelity, and measures 2mm thick.

1.2 Optical Density    NiSi Optical Nano Coating    Optical Glass Construction    Medium-Edged Line of Transition    Reduce Exposure in Selective Areas    Allows Reduced Shutter Speed    Allows Wider Aperture    Neutral Results, Visible, & IR Spectrums    Includews Leatherette Pouch

150 x 170mm graduated neutral density filter darkens bright areas of an image, such as skies, while leaving the remainder of the frame unaffected.

16x filter factor provides up to a 4-stop reduction of light in selective areas.

Medium-edged line of transition between the dense and clear areas.

Useful for images that include elements like rooftops and mountains that protrude into the sky.

Filter does not affect coloration of the image and is ideal for use with other filters.

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. 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: 2. Can the hard stop be removable?

A: According to the manufacturer, the hard stops on the NiSi 82mm True Color ND-Vario Pro Nano 1-5 Stops Variable ND Filter cannot be removed. If the variable neutral density filter had no hard stops, cross-type X-banding patterns would occur in your images.

Q: 3. is this appropriate for shooting solar eclipses?

A: Yes, the NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter (67mm, 16.5-Stop) can be used for solar eclipse shots. Note, it is not safe for direct viewing of the Sun.

Q: 4. Does it fit to rf 28-70?

A: Yes, the canon 28-70 RF features a 95mm filter ring.

Q: 5. will this allow me to use my lens hood (canon RF 28-70 F2.0) ?

A: Yes, one can use the hood from the Canon RF 28-70mm f/2 L USM Lens with the NiSi 95mm True Color ND-VARIO Pro Nano 1-5 Stop Variable Neutral Density Filter. You would need to remove the rotating lever from the filter, as that would get in the way,

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. I am going to use this filter on my 60-600mm lens. Doesn't X-effect occur at any focal length?

A: The NiSi True Color ND-VARIO Pro Nano 1 to 5-Stop Variable ND Filter (105mm) does not create an X pattern at all. An "X" pattern tends to happen on lower end variable ND filters that cover a broader stop range such as 2 to 8 stops.

Q: 8. 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: 9. Using this filter and a tracker can the camera be left pointing at the sun for long periods without damaging sensor or lens?

A: Yes, there should be no issue using the NiSi Solar Filter Pro Nano UV/IR Cut ND100000 Filter (95mm, 16.5-Stop) with a tracker when photographing the solar eclipse.

Q: 10. Could you provide a more specific nm range for this, or is the spectrum available?

A: Unfortunately, ND filters like the Solar Filter Pro Nano UV/IR Cut ND100000 Filter (77mm, 16.5-Stop) that cut UV and IR light do not specify a nanometer range. This is because they are meant for long exposures photos without a color shift and not for IR photography.