The #26 mount set adapts specific #2 housing types to the fluorescence light output of the DMR, DMRB, and the DMIRB type Leica microscopes. No modification to the microscope should be necessary. The #26 mount can be attached to all shutter types (LS or VS - excluding the CS45). A clearance cutoff (1.38in./35.1mm from the aperture center) is provided with the VS series only.