These filters offer both amateur and professional photographers HOYA's famous quality at reasonable prices. They have coatings applied to both surfaces to suppress reflection and increase light transmission.The Hoya 52mm Green X1 Glass Filter is ideal for scenes where it is important to differentiate the green tonal values in black-and-white photography. This Hoya filter's favourable effect on red tones makes it excellent for portraits, especially under tungsten lighting such as flash or photo bulbs. By darkening red and absorbing green and green-blue, skin and lips are rendered in a more natural tone as seen by the eye. This makes the Hoya Green filter great for correcting skin tones, bringing out facial expressions in close-ups and emphasizing the feeling of liveliness. Although designed primarily for use with black-and-white film, this filter can be used with colour film to produce special color effects well suited to landscape photography because it enhances the green color of the leaves in flower or forest picturesHOYA HMC 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%, giving sharp contrast and well balanced colour. HOYA HMC filters are recommended for enhancing the performance of todays multicoated lenses.