The LMR Series of fixed optics mounts are a convenient way to mount Ø2" (50 mm) optics on TR Series posts via the #8-32 (M4) tapped hole on the base of the mount. Each LMR series part has an internally threaded hole equipped with a back edge lip on which the optic rests. The retaining ring included with each mount can then be used to secure the optic in place by sandwiching the optic between the back lip and the retaining ring. Additional retaining rings can be purchased separately, including stress free retaining rings for select diameters. The LMR series of fixed optics mounts are also used as a mount to hold optical components with external SM1 threading.

• Internally and Externally SM2 Threading
• Mounts Optics up to 0.36" (9.1 mm) Thick
• Compatible with Externally SM2 Threaded Components

These fixed lens mounts have internal SM threading on one side and external SM threading on the other and an #8-32 (M4) tapped mounting hole. The optic is secured in the mount with the included retaining ring. Essentially, it is a lens tube that can be directly attached to a TR-Series Post. The internal threading is deep enough to hold an unmounted optic up to 0.36" (9.1 mm) thick, while the external threading is just deep enough to mount lens tubes, irises, or other internally threaded SM components (see picture to the right). The functionality of this part can be duplicated by combining two other Thorlabs parts: a lens tube slip ring and a lens tube. Comparatively, this fixed lens mount offers greater convenience and cost savings.

This mount allows an SM2 threaded lens tube to be mounted to a standard TR series via an #8-32 (M4) tap on the bottom of the mount. The SMR2 (SMR2/M) is internally SM2 (2.035"-40) threaded all the way through, allowing externally SM2 threaded components to be attached.

These nested lens mount sets are comprised of an inner optic carriage and an outer mounting ring (each sold separately). This allows easy exchange of optics while maintaining optical alignment. The "-A" inner carriage is radially laser engraved with graduation marks every 2°, labeled every 20°. The LM2-A carriage directly accepts Ø2" (50mm) optics up to a thickness of 0.48" (12.2mm) into its SM2 (2.035"-40) threaded bore. The mating LM2-B positionally locks the LM2-A with a top-located thumbscrew and is post-mountable via a bottom #8-32 (M4) tapped hole. Each LM2-A includes one SM2RR retaining ring for fastening optics within the SM2 (2.035"-40) bore.