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hoya are the largest worldwide producer of optical glass, in fact around 60% of the entire worldwide demand and supply is met by hoya. hoya offers a wide variety of superior quality filters for use in all imaging applications such as 35mm slr cameras, medium format, large format, video, cine and digital, it is important to select the best filters for your needs, as choosing inferior brands can deteriorate the performance of your high quality lenses. hoya filters guarantee you the highest standards so you can create the best images. filters for colour films as their name suggests, these filters use hoya coloured glass. they are used for colour correction of different light sources when using colour film, or for controlling contrast with black and white film. colour correction filters are important as colour films do not have the flexibility of the human eye to automatically adjust to different situations. black and white films register colours as shades of grey and the rendition of each colour in a scene is important, so filters can be used to do this. the colour of the glass in all these filters is carefully controlled and to reduce the possibility of colour shift over a period of time, such high quality filters are coated or multicoated on both sides. this maintains the desired effect and gives a long service life. filters are also required in black and white photography, but for a slightly different reason than colour photography. many people take photographs of a sky with white clouds - only to be disappointed because the entire sky area appears white in the finished print. in other cases, colours of clothing and other objects are rendered with an unnaural balance between tones in black and white photographs. all of these are due to the fact that back and white film does not respond to the various colours in the same way as does the human eye. the role of filters for black and white film is to correct picture contrast. selecting the proper filter can render white clouds vividly against a dark sky, or make the tones of coloured objects appear balanced and natural. special effect techniques can be used with both movie and still cameras by merely attaching them to the front of the lens like ordinary filters. special effect filters can also be combined with other types of filters for an endless variety of new effects. by understanding the nature of filters for colour and black and white films and special effect filters, you will be able to greatly advance the development of your photographic techniques.
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