Optical filters need to be specified with very high precision in every experimental set-up like single/multiphoton fluorescence or RAMAN spectroscopy methods. AHF Analysentechnik takes care on the individual experimental needs. Also personal preferences in special filter techniques can be considered. Some people prefer to work with multiband solutions, others prefer singleband filtersystems. Careful designs are worked out for individual solutions to gain maximum efficiency. DEMO filters will help to evaluate best possible solutions.