Metal lens hood made by HORSEMAN, compatible with 10mm, 20mm, and 40mm sizes. - Model: HORSEMAN Lens Hood - Sizes: 10mm, 20mm, 40mm - Thread Diameter: 81mm - Inner diameter of the base holder: 70mm (the ring with the HORSEMAN imprint) - Material: Metal - Application: For camera lenses I received this from a friend as a lens hood for a HORSEMAN 4x5 camera, but I'm not sure of its exact use, so I'm putting it up for sale. The exterior is very clean and shows little sign of use. Price reduced: 5000 yen -> 4500 yen Thank you for looking.