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• Positional Adjustment of an Optic Without Rotation
• SM1ZM: 4 mm of Travel at 0.5 mm Per Revolution for Ø1" Optics, SM1 Compatible
• SM1NR05: 18 mm of Travel at 17 mm Per Revolution for Ø1/2" Optics, SM1 Compatible
• SM2NR1: 29 mm of Travel at 17 mm Per Revolution for Ø1 Optics, SM2 Compatible

SM1ZM: High-Precision Differential Zoom Housing for Ø1" Optics, Non-Rotating
The SM1ZM non-rotating zoom housing provides 4 mm of linear travel without rotating the optical element mounted in it. This high precision (0.5 mm per revolution) zoom housing provides the ability to accurately control the exact working distance of an optical element within a system without rotation, and lock it into place. Ø1" optics are mounted in the zoom housing using the included SM1RR retaining ring. Once secure, the outer ring of the SM1ZM can be used to precisely position the optic. Although a lens tube can be attached to front of the SM1ZM, it should only be done after the position of the optic has been fixed since this lens tube will need to be free to translate if the position of the optic is changed.

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SM1NR05: Long-Travel Zoom Housing for Ø1/2" Optics, Non-Rotating
Thorlabs' SM1NR05 provides 17mm of non-rotating adjustment for Ø1/2" optics in a lens tube system. It contains an internal SM05 Threaded cell where optics are installed using the included SM05RR retaining ring. A double helical mechanism moves the optic back and forth while restricting any rotational movement. The SM1NR05 is SM1 threaded (1.035" - 40), and can be attached between two fixed Ø1" lens tubes while still retaining the ability to adjust the position of the optic.

SM2NR1: Long-Travel Zoom Housing for Ø1" Optics, Non-Rotating
Thorlabs' SM2NR1 provides 1.16" (29 mm) of non-rotating adjustment for Ø1" optics in a lens tube system. It contains an internal SM1 Threaded cell where optics are installed using the included SM1RR retaining ring. A double helical mechanism moves the optic back and forth while restricting any rotational movement. The SM2NR1 is SM2 threaded (2.035" - 40), and can be attached between two fixed Ø2" lens tubes while still retaining the ability to adjust the position of the optic.

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This SM05-threaded (0.535"-40) adjustable-length lens tubes allows Ø1/2" optics to be precisely positioned along the optical axis of a lens tube | system. To operate, mount the optic in the adjustable-length lens tube using the included retaining ring. Then thread the adjustable-length lens tube into a compatible (i.e., matching threads) lens tube or SM-threaded lens mount until the optic is at the desired position. At this point, the included locking ring can be used to fix the position of the optic. These rotating adjustable-length lens tubes are an ideal solution for fine tuning of the first and last lenses in a lens tube system. Although a lens tube can be attached to the front of the adjustable-length lens tubes, it should only be done after the position of the optic has been fixed since this lens tube will need to be free to rotate and translate if the position of the optic is changed.