Exhibiting improved clarity, flatness, and reduced reflectivity, this 105mm Firecrest Ultra ND 3.9 Filter from Formatt Hitech is a neutral density filter providing a 13-stop reduction in exposure. This 3.9 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. Designed using inspiration from their cine Firecrest filters, these Ultra filters receive an additional lapping and polishing process during production to ensure lower reflectivity and improved clarity and sharpness.

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 to 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.

3.9 Optical Density    15-Layer Coating on Outside of Filter    SCHOTT Superwite Glass    SuperSlim 5.5mm-Thick, Stackable Ring    Hydrophobic and Scratch Resistant    Darkens Entire Image    Neutral Results Across All Spectrums    Secondary Lapping and Polishing Process

The Firecrest Ultra series filters exhibit greater clarity and have lower reflectivity than the original Firecrest filters. Borrowing from the range of Firecrest cine filters, the Ultra series filters undergo a secondary lapping and polishing process after the initial polishing and bonding stage. This additional step helps to ensure flatness and consistency for improved image quality.

ND 3.9 filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.

Providing a 13-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 resistance 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. Does this filter case any noticable vignette?

A: No.

Q: 2. Does it have front threads? Does it have hard stops?

A: Okko 82mm Variable Neutral Density Filter (1 to 9 Stop) do not have a front threads or hard stops.

Q: 3. will I be able to use the hood on my 35mm 1.2 voightlander with this filter?

A: I have this filter in 49mm on a Pentax FA 43 and I am able to screw on a B+W metal hood with no problem.

Q: 4. Does it have a front filter thread to stack another filter?

A: Yes the Hoya 77mm ND (NDX8) 0.9 Filter (3-Stop) has 77mm front threads so you can stack additional filters.

Q: 5. does this have a front thread to take the 82mm circ. polarizer included in some of the formatt hitech kits?

A: No

Q: 6. Hi there! Does this filter have front threads? Thanks!

A: The Hoya 82mm ND (NDX8) 0.9 Filter (3-Stop) does have 82mm front filter threads.

Q: 7. does this work on this system http://nikonrumors.com/2013/09/07/fotodiox-wonderpana-145-adapter-kit-for-the-nikon-14-24mm-f2-8-lens-review.aspx/and has anyone used it and liked the results??? susan

A: Yes, the FotodioX 145mm Pro Ultra Slim Neutral Density Filter is compatible with the Wonderpana 145 Adapter Kit for the Nikon 14-24mm f/2.8. Unfortunately, no one has reviewed this combination on our website.

Q: 8. is this compatible with a 50mm sony lens?

A: Yes it is.

Q: 9. Do these filters come with a front filter thread so you can attach a CPL Filter?

A: Yes, it has a 82mm front thread.

Q: 10. mounted on metal or plastic?

A: Metal