Size: 46mmThe 46 mm HMC Red Filter is especially effective for increasing contrast in black and white photography. It is ideal for creating dramatic effects in landscapes, where blue skies are darkened to almost black and white clouds stand out very strongly. These popular filters are renowned for their ability to minimise reflection at the filter surfaces which reduces flare and ghosting. The result is an average light transmission of over 97 percent, giving sharp contrast and well balanced colour. HMC Filters are recommended for enhancing the performance of today's multi-coated lenses.