K&F Concept 37mm ND Filter Variable Fader NDX Neutral Density Adjustable ND2 to ND400 Lens Filter Kit + Cleaning Cloth for Cameras Lens Size:37MM The PT-9110-00 is also available

The PT-9110-00 is also available in a convenient 10 pack

it produces a sweet tinkling sound when struck together

How do you guys do it

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K&F Concept 37mm ND Filter Variable Fader NDX Neutral Density Adjustable ND2 to ND400 Lens Filter Kit + Cleaning Cloth for Cameras Lens Size:37MM The PT-9110-00 is also availableK&F Concept 37mm ND Filter Variable Fader NDX Neutral Density Adjustable ND2 to ND400 Lens Filter Kit + Cleaning Cloth for Cameras Lens Slim Adjustable ND Filter Feature: Reduces the amount of light reaching the film without affecting the color. Applies slow shutter speed under strong sunlight exposure. Glass mounted with high pressure press technology. Made of high quality optical glass by K&F Concept technology. Wider outer optic to help reduce