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A ND filter blocks the light & less light passes through the lens. The Neutral-density filter is the first choice of landscape photographers. If you want to buy high quality Neutral density filters for photography then Singh Ray is the best manufacturer
ND Filter PhotographyNDFilters, Camerafilters,
Our 690 IR filter emits sufficient infrared light to create pleasing infrared images in both color and black & white — and dramatically cuts exposure times (depending on ISO, from less than one second to 2-3 seconds)
Infrared FilterInfrared Filter, Camera Filter