Ilford Multigrade Above Lens Filter Kit 15.2 x 15.2cm\n\nThe contrast of ILFORD MULTIGRADE is changed by the colour of the light used to expose it. MULTIGRADE filters provide the simplest way of controlling the contrast throughout the whole of the range achievable.\nThere are 12 filters in the MULTIGRADE filter set, covering the equivalent of paper grades 00 to 5, including half grades. The filters are available in squares for use above the lens, and mounted in holders for use below the lens.\nFilter 00 (yellow) gives the lowest contrast; filter 5 (magenta) gives the highest contrast.\nThe above-lens filters are available as sets 15.2cm (6in) square and 8.9cm (3\u00BD in) square, and individually in 30.5cm (12 in) squares. The below-lens kit includes a ruby \u201Csafe\u201D filter, and a universal filter holder that fits easily onto almost any enlarger or lens.\nIf your enlarger has a filter drawer, you can simply drop filter squares into the drawer to change the contrast o.