The Nikon DM510 nanometer filter block is new with the 510 Dichroic mirror. It is missing the barrier filter and exciter filter allowing the user to build what ever filter system they desire by ordering these two components from Chroma or Omega. Also, the dichroic mirror is easily removed and the block then becomes a vehicle for whatever parameter cube one wishes to build. This block is designed to fit the Labophot, Labophot-2, Optiphot, Optiphot-2, Microphot, and TMD inverted microscope. Thanks for looking!