This 40.5mm Tiffen ND Filter is a solid ND filter with a filter factor of 64x that provides a 6-stop exposure reduction. Its 1.8 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower 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. Neutral density filters do not affect the coloration of the image and are ideal for pairing with other filters.

This filter is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding flat to a tolerance of 1/10,000th of an inch, and then mounting to precision metal rings.

1.8 Optical Density    ColorCore Technology    40.5mm Front Threads    Darkens Entire Image    Allows Reduced Shutter Speed    Allows Wider Aperture    Includes Plastic Case

The 1.8 neutral density filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required.

Providing a 6-stop exposure reduction, this filter allows you to control depth of field and convey movement more easily.

Filter does not affect coloration of the image and is ideal for use with other filters.

Front filter threads allow for use with other filters.

Plastic filter case for storage and transport.

Related Questions and Answers

Q: 1. Is there any reason this can't be stacked on a B&W 77mm ND1.5 to get an effective variable 1.8-3.0? Will that cause any unexpected issues with artifacts or the dreaded X, etc?

A: I believe this should be possible. The only concern would possible corner vigneting when using a wide angle lens. Dan

Q: 2. Will this fit canon drop in filters?

A: No, Neewer EF to EOS R Mount Adapter with Variable ND Filter (1.5-9 Stop) uses a properitary drop in filter.

Q: 3. What is the widest focal length this can be used on with no vignetting?

A: I have the filter on my 24-70mm/f2.8 lens. So the widest is 24mm. I did not see any vignetting. I am very happy with this filter.

Q: 4. Can I mount this filter on my zeiss planar f 1.4 50 mm ?

A: If you own the Zeiss Planar T* 50mm F/1.4 ZF.2 Lens, B&H # ZE5014ZF2N, which has 58mm filter threads, yes, the B+W 58mm XS-Pro Digital ND Vario MRC nano Filter would be compatible for use with your lens.

Q: 5. Is there a case available for these yet? Looking to clip somewhere between 3 and 7 of them to my belt for gimbal work.

A: No, there is not currently a NiSi branded case for the NiSi Full Spectrum FS ND Drop-In Filter for ATHENA Lenses (7-Stop). However, you could consider using a case like the ARRI Camera Assistant Belt Pouch (Large), BH #ARK20013016, or the WANDRD D1 Fanny Pack (Wasatch Green), BH #WAD1FPWG2, to carry several of the filters.

Q: 6. I have a Batis 25mm. will this filter fit the lens, and also, will the original lens cap fit on top of this filter?

A: Yes, this will fit the 67mm filter threads of the ZEISS Batis 25mm f/2 Lens for Sony E. However, since this filter is made wider so as to avoid vignetting, you will need a 72mm lens cap. Here is a quality one to match your lens. B+W 72mm Pro Snap-On Lens Cap MFR #65-1065134 • BH #BWLC72

Q: 7. Hi. Can this filter be used on a Leica 50mm APO-Summicron-M ASPH f/2.0 lens? Thank you.

A: The lens has a 39mm filter thread. This filter would not be compatible. B+W makes the same filter in 52mm. If you use a 39-52mm step up ring, then you will be able to use this filter on the Leica lens.Here is the step up ring: http://bhpho.to/1u0UKvfHere is the filter: http://bhpho.to/1qoJGa9

Q: 8. Does this create vignetting on the Voigt 40mm f/1.2 on a Leica M?

A: No, this filter should not cause vignetting on a 40mm lens.

Q: 9. will this filter vignette with the Canon EF 16-35mm F4L lens?

A: I'm a Nikon shooter, so my answer is in that context. I no longer have my Nikkor 17-35, so the best other lens I could test it on is my Nikkor 12-24, which is a DX lens (also a 77mm diameter). Yours, however, is an FX lens, so I don't know how that may affect the comparison. I tested it on the D800, in full format mode. I noticed the beginning of vignetting when the focal length was 19mm. I did it a few times, and that was consistent.So, if this is in any way accurate, you can probably expect to lose a few mm of focal length at the3 wide end when you use this filter. I don't know if this filter is made in a thinner version for wide angle use. Hope this helped.

Q: 10. Anyone having issues using lens caps and this filter? Can you share what lens cap you're using on top of this?

A: I use the lens cap that came with the filter, and it works quiet well - it's a slip-on, but seems to stay without any issues.