This plastic hood acts as a lens shade and clips directly on to the Cokin "A" filter holder. You can stack up to five hoods together to create a longer lens shade for telephoto lenses.
Attaches to outside of filter holder
Doesn't impede graduated filters' movements
(assuming a 24 x 36mm format 'full-frame' DSLR or 35mm camera...) - Use 1 hood for a 28mm lens (many 24mm lenses also work) - Use 2 hoods for 35mm lenses - Use 3 hoods for 50mm lenses - Use 4 hoods for 50-80mm lenses - Use 5 hoods for lenses 85mm and longer