This 150 x 150mm Hitech Firecrest ND Filter for Solar Photography 150mmis 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. It measures 5.9 x 5.9" / 150 x 150mm and is 0.08" / 2mm-thick, making it compatible with the LEE SW-150 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.

2.1 Optical Density    15-Layer Coating on Outside of Filter    Hydrophobic and Scratch Resistant    2mm-Thick SCHOTT Superwite Glass    Increase Exposure Length    Greater Control Over Exposures    Neutral Results Across All Spectrums    Fits LEE SW-150 Filter Holder    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 its 2mm-thick design is compatible with the LEE SW-150 Filter Holder.

Related Questions and Answers

Q: 1. 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: 2. Does this filter fit Cokin P holder?

A: Yes, you'll need the adapter ring for the P holder, but it does work with either the Formatt-Hitech or Cokin P Filter Holders.

Q: 3. 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: 4. 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: 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. Can this filter be used to good effect other than sunrise and sunset?

A: You could use it whenever you have a very bright light source of light in the frame. This would tame some of that brightness.

Q: 7. Will these Formatt 46mm Firecrest Ultras fit the Z800 mm as screw in filters?

A: The Nikon 52mm Circular Polarizer (C-PL3L) Glass Filter compatible with the Nikon NIKKOR Z 800mm f/6.3 VR S Lens does not allow the 46 mm polarizing filter to come off and to be changed with another filter so this Formatt Hitech 46mm Firecrest Ultra ND 0.9 Filter can't be used.

Q: 8. What is the weight of this filter?

A: I dont know.

Q: 9. Does it have a gasket like the big stopper?

A: No.

Q: 10. Does this filter come in a case?

A: No it doesnt!I boughta href= http://www.bhphotovideo.com/c/product/212303-REG/B_W_65024717_E1_Filter_Pouch.html target= _blank http://www.bhphotovideo.com/c/product/212303-REG/B_W_65024717_E1_Filter_Pouch.html/aAnd its suitable.Mika from Finland