This 100 x 100mm ProGlass IRND Filter from LEE Filters is an ND filter with a 64x filter factor that provides a 6-stop exposure reduction. Its 1.8 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you can control depth of field and convey movement more easily. Neutral density filters are intended to not affect the coloration of the image and are ideal for pairing with other filters.

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.

This 100 x 100mm ProGlass IRND 1.8 Filter is constructed from scratch-resistant, optical glass for clarity as well as color fidelity and features a built-in gasket. This gasket works with a compatible LEE Filters 100mm System filter holder to help form a seal that is intended to prevent stray light, which could have unwanted effects on exposure, from coming in between the filter and the lens behind it. For efficient use in the field, an exposure guide is included that shows the amount of exposure reduction the 100 x 100mm ProGlass IRND 1.8 Filter provides, corresponding to a range of shutter speed settings from 1/1,000th of a second to 2 seconds before the filter is applied.

1.8 Optical Density    Scratch Resistant, Optical Glass    For Lee Filters 100mm System Holder    Darkens Entire Image    Allows Reduced Shutter Speed    Allows Wider Aperture    Neutral Results, Visible, & IR Spectrums    Gasket for Light-Blocking Seal    Exposure Guide    Padded Pouch

• Compatible with a LEE Filters 100mm System filter holder.
• 100 x 100mm neutral density filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.
• Providing a 6-stop exposure reduction, this filter allows you to control depth of field and convey movement more easily.
• Filter does not affect coloration of the image and is appropriate for use with other filters.
• Attenuates infrared light as well as visible wavelengths, to maintain color neutrality and suppress color casts due to increased exposure times.
• Constructed from optical glass for clarity.
• When combined with a LEE Filters 100mm System filter holder, built-in gasket helps to prevent light from coming in between the filter and the lens behind it, which can have an unwanted effect on exposure.
• Exposure guide for efficient use in the field.
• Padded pouch included for storage and transport.

Related Questions and Answers

Q: 1. I know this frame takes lee filters, but does it also take cokin or other 100x100mm?

A: Yes. This will work with any 100 x 100mm, 2mm thick filter.

Q: 2. Is this PetaPixel's PureNight filter with the magnetic frame?

A: We're afraid not. This is not the filter reviewed on PetaPixel. Also, H&Y is not the manufacturer of the filter mentioned on PetaPixel. That being said this is still a great option for a 100 x 100mm filter to reduce light pollution in the night sky.

Q: 3. I want to get this adapter and LEE filter holder. I want to use a breakthrough solid ND filter 77mm on my Canon 24-105mm lens and add a LEE graduated ND filter to the holder. Is this setup possible? Thanks in advance.

A: It could work but it's not how its meant to be used. By doing so, you will darken your scene in your viewfinder and make it difficult to align the Grad filter with the horizon in your scene. You may also introduce vignetting in the corners. Its better to use the square Lee ND and Lee Grad filters in a Lee holder which is attach to your 77mm lens via a Lee 77mm adapter ring. Then place the Grad first to balance/darken the sky with the below scene, then add a ND to make a long exposure. Depending how dark is your ND Filter is, you will need calculate the number of stops introduced to your base exposure.Hope that helps.

Q: 4. Does this adapter also work with the LEE Filters Universal (Medium Wide) Lens Hood? Looking to purchase for my Nikon 24mm Tilt Shift lens. Thanks, Mel

A: Yes Nikon 24mm Tilt Shift lens is 77mm

Q: 5. I have an APS-C sensor camera and want to use my Sigma 17-50mm F/2.8 lens, should I get the Lee 77mm Wide Angle Lens Adapter vs the Lee regular 77mm adapter?

A: Yes, I would get the wide angle adapter to help alleviate vignetting at the wide end of the lens.

Q: 6. I am using a Tokina 11-20 lens, and would like to purchase a 82mm ring, would I be getting the standard one or the wide angle? What is the vignetting like on each ring?

A: Yes, you need the wide version to use the Tokina 11-20mm with the Lee Filters holder.

Q: 7. Can the lee 100mm system be used on micro 4/3 lens?

A: Yes, not a problem as long as you get the correct size adapter ring.

Q: 8. Does this filter holder require glue or any kind of adhesive? Are you able to take the frame off and use your filters elsewhere, if you end up not sticking with this system?

A: It comes with the frame which clicks into itself. You can then remove and add filters as needed with this system to make it interchangeable.

Q: 9. Can you fit 6 150x100mm Armour Filters in this Case?

A: According to Kase's website, the Armour filter bag accommodates up to three 150 x 100mm filters plus the Armour filter holder itself.

Q: 10. Can this filter be used with the Nisi v7 filter holder?

A: Yes, the NiSi V7 Alpha 100mm Aluminum Filter Holder can be used with the Haida Red Diamond ND6.0 Filter (100 x 100mm, 20-Stop).