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./35.1mmfrom the aperture center) is provided with the VS series only.