• [2021 Newest] Variable fader ND2-ND400 Filter reduce the light from 1 to 9 f-stops
• [Professional Materials] Made by Completed Professional Optical Glasses instead of Optical Resin, with double-side multilayer blue coating to help repel water
• [Exposure Reduction] ND filters are strongly recommended for rivers, waterfalls, and other bodies of water, especially under bright light. The longer exposure times allows for smoother water movements, shallower depth of field, and blurred motion
• [Ultra-Slim] The filter frame is only 7.3mm, and super lightweight CNC ring used in construction prevents adverse effect
• [Tips] This Filter kit is compatible with all corresponding size lenses. Please verify your camera's lens thread size before ordering. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "ø" (diameter) symbol

Product Description

Why choose US?

1. Reduces the amount of light reaching the lens without affecting the color.
2. Multi Resistance Coating (MRC) helping repel water, dust & grease, while also preventing ghosting.
3. Applies slow shutter speed under strong sunlight exposure.
4. Glass mounted with high pressure press technology.
5. Made of high quality optical glass by senior professional technology.
6. Wider outer optic to help reduce vignetting at wide angles.
7. Extinction paint seiko manufacturing, to achieve the testing sights on military standard.

Comparison of effects

Without ND Filter	Use Contrast	With ND Filter

Comparison of ND2 to ND400

 

 

Other

The border is thick, causing vignetting around

 

K&F Concept

Thin frame design to ensure no dark corner

	Optical density	F-stop reduction	Fractional transmittance
No ND	0	0	100%
ND2	0.3	1	50%
ND4	0.6	2	25%
ND8	0.9	3	12.5%
ND16	1.2	4	6.25%
ND32	1.5	5	3.13%
ND64	1.8	6	1.56%
ND128	2.1	7	0.78%
ND256	2.4	8	0.39%
ND400	2.6	8 2⁄3	0.25%