Thorlabs offers a variety of mounts for lenses and mirrors, as well as posts and bases to support them, in order to build experimental setups to be used within a vacuum chamber. Pinholes can be used for alignment and are available in diameters ranging from 5 µm to 2mm. Vented lens tubes can be used for large systems of elements along the optical axis. Lens tubes are available in Ø1/2", Ø1", and Ø2". Each item comes vacuum packaged for cleanroom use.