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There are 3 types of filter for the Jenway fluorimeters. The bandpass filters are ideal as excitation filters as they allow only the light between the specified wavelengths through to the sample. For example, UG1 allows all the light between 320 and 380nm through and excludes the light below 320nm and above 380nm. The cut-off and interference filters are normally used as the emission filters where a much narrower range of wavelengths is required. The cut-off filters block all light below the specified wavelength and the interference filters allow the specified wavelength and light ±5nm of this through to the sample.