| abstract |
An optical detection filter has a transmission spectrum for detecting fluorescence light of a plurality of different fluorescent dyes. In the range between 350 nm and 1000 nm, the transmission spectrum has a first stopband ( D S1) from D λ1 to D λ2, a first passband ( D D1) from D λ2 to D λ3, a second stopband ( D S2) from D λ3 to D λ4, a second passband ( D D2) from D λ4 to D λ5, a third stopband ( D S3) from D λ5 to D λ6, and a third passband ( D D3) from D λ6 to D λ7. The stopbands ( D S1, D S2, D S3) each have a mean transmittance of at most 0.01, typically at most 0.001 or at most 0.0001, and the passbands ( D D1, D D2) each have a mean transmittance of at least 0.5, typically at least 0.8 or at least 0.9; wherein 350 nm≤ D λ1< D λ2< D λ3< D λ4< D λ5< D λ6< D λ7<1000 nm. |