The 52mm Formatt Hitech 52mm 7-Stop ND Filteris a solid neutral density filter providing a 7-stop reduction in exposure. This 2.1 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.

2.1 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 2.1 filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.

Providing a 7-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. Is it really made in Japan like the picture shows?

A: Yes, this filter is made in Japan.

Q: 2. 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: 3. Do I need a filter holder for an Hoya nd filter?

A: No, this filter screws on to the lens.

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. is this ND filter ideal for video use? I plan on using it with a Sony FDR-AX33 4K camera.

A: Actually the newest ND filter by Hoya (the SOLAS filter series) would be more suited for video work:https://a href= http://www.bhphotovideo.com/c/product/1285182-REG/hoya_xsl_46irnd09_46mm_solas_0_9_irnd.html target= _blank www.bhphotovideo.com/c/product/1285182-REG/hoya_xsl_46irnd09_46mm_solas_0_9_irnd.html/a

Q: 6. Will this vignette with 7.5mm ultrawide Laowa lens?

A: You will get some vignetting when using this filter on the 7.5 but can be corrected in post.

Q: 7. Is this compatible with a 40mm lens?

A: It depends on which particular make and model 40mm lens you are inquiring regarding. The underside of the lens cap will feature the lens' cap/filter size and you can check on your lens there. If you're still not sure you may email askbh@a href= http://bhphoto.com target= _blank bhphoto.com/a and indicate your specific lens and we can confirm.

Q: 8. Does this filter case any noticable vignette?

A: No.

Q: 9. Is this filter stackable? And what does the 106M mean in the name?

A: Yes I have stacked them with no visible lose to optical quality.

Q: 10. Does this filter fit the Sony 24-70mm G-Master lens?

A: No, this is too small. You would need the Hoya 82mm ND (NDX8) 0.9 Filter (3-Stop) (http://bhpho.to/2aYyUXX) for the Sony FE 24-70mm F2.8 GM.