The 72mm Formatt Hitech 16-Stop ND Filter 72mmis a solid neutral density filter providing a 16-stop reduction in exposure. This 4.8 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or longer shutter speed than normally required. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily.

The design of this filter has been optimized for use with digital sensors and promote nearly flat attenuation of visible, UV, 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 filter provides a high level of neutrality across all three spectrums in order to eliminate color casts and ensure cleaner, truer blacks.

Applied to the outside of the Schott Superwite glass construction is a 15-layer Firecrest multicoating, which helps to minimize reflections and flare in order maintain truer colors and contrast. The multicoating is also scratch resistant and hydrophobic to benefit the overall durability of the filter. The filter is set within a 5.5mm-thick SuperSlim aluminum filter ring, which features front threads for stacking additional filters or attaching a lens cap.

This filter is designed specifically for photography applications. This filter is not suitable for direct solar viewing with the naked eye, including with optical viewfinders.

4.8 Optical Density    15-Layer Coating on Outside of Filter    Hydrophobic and Scratch Resistant    Schott Superwite Glass    SuperSlim 5.5mm-Thick, Stackable Ring    Designed for Solar Photography    Increase Exposure Length    Greater Control Over Exposures    Neutral Results Across All Spectrums    Includes Pouch

ND 4.8 filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.

Providing a 16-stop exposure reduction, this filter allows you to control depth of field and convey movement more easily.

Attenuates infrared light, as well as visible and UV wavelengths, to maintain color neutrality and suppress color casts due to increased exposure lengths.

The 15-layer Firecrest coating has been applied directly to the outside of the filter glass by way of a vacuum-formed, hard-coated, electrolytic process. The multicoating is water and scratch resistant for greater overall durability.

Schott Superwite glass promotes maintained image clarity and is set within a 5.5mm-thick SuperSlim aluminum filter ring.

Related Questions and Answers

Q: 1. In regards to the solar filters, is there any color change to the sun? Is it more yellow/orange, or white like other filters?

A: The Formatt Hitech 105mm Firecrest Ultra ND 6.0 Filter (20-Stop) would render color very similar to what the eye sees. This filter should not be used for directly viewing the sun; always use an approved ISO 12312-2 certified solar filter when observing the Sun through optics or cameras.

Q: 2. I have both ND 1.8 and 3.0. I found they are so different in coating. Both sides of ND 3.0 are the same. Surface of ND 3.0 like a blue mirror. I can see myself clearly in it. One side of ND 1.8 like a normal mirror with very low reflection. Another side of ND 1.8 have variant color looked in different direction. Both NDs are purchased in B&H. The 1.8 one is used. I'm not sure whether they are all right. Can you confirm this? Thank you.

A: I have both ND 1.8 and 0.9. Both sides of ND 1.8 and 0.9 are the sameSurface of ND 1.8 and 0.9 like a blue

Q: 3. Purchased FirecrestUltra 100x100mm ND 3.0 filter. It came with some self sticking foam gasket in separate bag. There are no instructions how to install the gasket.Question: which side of the filter should the gasket be installed on? One side of the filter has writing on.

A: Put the gasket on the side that does NOT have the writing.

Q: 4. Does this filter fit Cokin P holder?

A: Yes, it will fit either the Formatt Hitech or Cokin P Series filter holder.

Q: 5. Is this filter rated as a solar filter suitable for photographing the sun?

A: Formatt Hitech 105mm Firecrest Ultra ND 5.4 Filter (18-Stop) does not have an ISO rating for safe solar viewing. It may work for a camera as it is not sensitive as human eyes, but if you want to be 100% safe I would recommend looking for a filter that is listed with an ISO rating for safe solar viewing.

Q: 6. is this the same as firecrest irnd filter? I have firecrest irnd filter now and is looking for another one.

A: This filter is an IRND filter from the Firecrest Series.

Q: 7. Is this filter compatible with the Sigma 8mm f/3.5 EX DG Circular Fisheye lens? In particular, will there be the Vignette effect？

A: I don't know how you plan on attaching it to the lens but if you just hold it in front of the lens, you will get some vignetting that can be adjusted in post. BTW, there is really no other way to use a filter with this lens other than holding it or using the rear gelatin filter holder that takes cut to size gel filters.

Q: 8. Will this work with the smallrig Lightweight Matte Box? I see many people saying 100x100mm are incompatible but they say 4x4 inch are... confusing or what??

A: The Formatt Hitech 100 x 100mm Firecrest Ultra ND 0.9 Filter (3-Stop) is incompatible with the SmallRig Lightweight Carbon Fiber Matte Box because the filter trays on the matte box support 4mm thick filters, and the Formatt Hitech filter is 2mm thick.

Q: 9. Are the filters stackable?

A: It is stackable. It does have 77 mm front filter thread.

Q: 10. Will these work on the lee holder system??

A: Yes you could use these with a 100mm Lee holder https://bhpho.to/2QqpVki.