Zoom

• SM1V05 Travel Range: 0.32" (8 mm)
• SM1V10 Travel Range: 0.81" (20.7 mm)
• Max Optic Thickness 0.42" (10.7 mm)

These SM1-threaded (1.035"-40) adjustable-length lens tubes allow Ø1" 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 SM1 threaded lens mount until the optic is at the desired position. At this point, the included SM1NT 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. Like our standard lens tubes, these adjustable-length lens tubes are made of black anodized aluminum.

Zoom

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

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. A fine helical mechanism moves the front barrel back and forth while restricting any rotational movement, preventing any rotation of the attached lens tubes or optics (see image to the right). 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 prior to locking it into place. To operate, mount a Ø1" optic in the zoom housing and secure it using the included SM1RR retaining ring. Then attach the SM1ZM to an internally threaded SM1 lens tube or mount. Once secure, the outer ring of the SM1ZM can be used to precisely position the optic. It should be noted that only the outer ring rotates; the optics and lens tubes attached to the SM1ZM do not rotate. Additionally, the externally threaded side of the SM1ZM provides a static reference, neither rotating nor translating (see image to the right). 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.

Long-Travel Zoom Housing for Ø1/2" Optics, Non-Rotating
The SM1NR05 non-rotating zoom housing provides 18 mm of linear travel without rotating the optical element mounted in it. A double helical mechanism moves the interior SM05 barrel back and forth while restricting any rotational movement. This high precision (17 mm per revolution) zoom housing provides the ability to accurately control the exact working distance of an optical element within a system. To operate, mount a Ø1/2" optic in the zoom housing and secure it using the included SM05RR retaining ring. Then the SM1NR05 can be mounted on any SM1 threaded lens tube or mount. Once secure, the outer ring of the SM1NR05 can be used to precisely position the optic. Unlike all of the other adjustable lens tubes on this page, the SM1NR05 can be attached between two fixed Ø1" lens tubes while still retaining the ability to adjust the position of the optic.