Exhibiting improved clarity, flatness, and reduced reflectivity, the 100 x 100mm Hitech Firecrest Ultra ND Filter for Solar Photographyfrom Hitech Firecrest Ultra ND Filter for Solar Photographyis a neutral density filter providing a 22-stop reduction in exposure. This 6.6 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 can control depth of field and convey movement more easily. Designed using inspiration from their cine Firecrest filters, this Ultra line of filters receives 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 promotes 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. It measures 3.9 x 3.9" / 100 x 100mm and is 2mm thick, making it compatible with the Formatt Hitech 100mm Filter Holder.

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.

6.6 Optical Density    15-Layer Coating on Outside of Filter    Hydrophobic and Scratch Resistant    2mm-Thick SCHOTT Superwite Glass    Darkens Entire Image    Neutral Results Across All Spectrums    Secondary Lapping and Polishing Process    Fits Formatt Hitech 100mm Filter Holder

The Ultra series of Firecrest filters exhibit greater clarity and have lower reflectivity than the original Firecrest filters. Borrowing from the range of Firecrest cine filters, the Ultra series 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 6.6 filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.

Providing a 22-stop exposure reduction, this filter allows you to control depth of field and convey movement more easily.

It 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 its 2mm-thick design is compatible with the Formatt Hitech 100mm Filter Holder.

Related Questions and Answers

Q: 1. Will this fit the Haida M-15 filter holder?

A: Yes, the Haida M15 Filter Holder will hold the LEE Filters 150 x 150mm SW150 Solar Stopper Neutral Density 6.0 Filter (20 Stop) BH #LESSWQ • MFR #SW150SOL

Q: 2. does this work for the tokina 16-28mm pro system?

A: This filter will not work with a Tokina 16-28mm pro. We do have special filter holders for that lens. https://bhpho.to/2WkRXmt

Q: 3. Can I look through my viewfinder with this on?

A: The usual practice to to do all the focusing & framing , Before you put this on, because its way too dark.

Q: 4. So is this filter ISO 12312-2 (also written as ISO 12312-2:2015) certified?

A: Yes it is: https://hoyafilter.com/product/prond100000/

Q: 5. Is this filter ISO 12312-2 certified?

A: This is the only information Hoya is publishing: https://hoyafilter.com/product/prond100000/#description

Q: 6. Can you confirm this filter can be used to film the solar eclipse? What's the total time frame?

A: The Marumi 77mm DHG ND-100000 Solid Neutral Density 5.0 Solar Eclipse Filter (16.5 Stops) is unsuitable for photographing the solar eclipse. The filter does not cut harmful IR and UV light.

Q: 7. Is this filter, ND100,000 safe to photograph the sun? For a prolong period like a solar eclipse , 4-6 hours?

A: 4-6 hours is a lot. Usually an eclipse you take a photo that is fractions of a second. This ICE Magco Solar filter does not list reducing UV and infrared. If you plan on doing long exposures of the sun I recommend a filter that reduces UV and infrared like this one DayStar Filters 90mm White-Light Universal Lens Solar Filter https://www.bhphotovideo.com/c/product/1319794-REG

Q: 8. Can one place the 77 mm Hoya CPD-77ND100000 ND filter over a 77mm Hoya UV filter, and in so doing protect the sensor further from UV? There may be slight vignetting, but if shooting an eclipse that will not matter.

A: Yes you could do this. That way you protect the Sensor more. That shouldn't be an issue. You just might have a slight Vignette.

Q: 9. Does The Hoya XPD-77ND100000 ND Filter also filter UV and IR, or does it act only on visible light?

A: It is not a UV or IR filter. It is just neutral density.

Q: 10. Will this filter produce an image with yellow sun or white color cast sun?

A: The Hoya ProND-100000 Neutral Density 5.0 Solar Filter (82mm, 16.6-Stop) will produce a yellow/color cast not white of the Sun. One of the safest filters does produce white color. And that is, https://bhpho.to/3Q9J3n6.