ITEM NAME:77mm ND2-400 Adjustable Filter, Dimmer, Medium Gray Filter, Filter, Medium GC6C9 77mm ND2-400 Adjustable Filter, Dimmer, Medium Gray Filter, Filter, Medium GC6C9 ND2-ND400 adjustable ND filter: ND mirror, also called medium gray density mirror, its role is to filter light. This filtering effect is non-selective, that is, the ND mirror's ability to reduce light of various wavelengths is equal and uniform. Filter type: Adjustable ND filter The outer ring of this rotating filter can be adjusted arbitrarily. It can be adjusted from ND2 to ND4 and then to ND8 until adjustment. Caliber: 77mm Light reduction mirror (gray scale) series (suitable for special effects with large aperture or slow shutter during daytime) (1) ND-2: It can reduce the aperture of level 1 and the amount of light by 50%; (2) ND-4: It can reduce 2 stops and 75% of light; (3) ND-8: 3 levels of aperture and 87.5% light can be reduced; (4) ND-400: It can reduce the light quantity of 9 stops, which is suitable for long-time exposure during the day and shooting the sun. Note: The wide-angle end of this ND mirror cannot be used, please take care when shooting! Color: Black + transparent Material: glass + metal Size: 8*8*2cm Package Contents: 1 * 77mm medium gray density filter 1 * Packing box.The outer ring of this rotating filter can be adjusted arbitrarily. Caliber: 77mm. This filtering effect is non-selective, that is, the ND mirror's ability to reduce light of various wavelengths is equal and uniform.