B004AS3M12 Fader 58mm Mark II Variable Neutral Density Filter – Fader VND-58II

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Create a slow shutter speed under heavy sun light
Allows the use of a large aperture under bright settings
Easier to control Flash output
Offers 2 to 8 stops added density
No need to carry a bunch of Filters for shooting. One filter gives you the rangefrom ND2 to ND400