Adjustable Ø3" Lens Tubes


Ø3" Rotating Adjustable-Length Lens Tube

  • 3.035"-40 Threading
  • 0.89" (22.6 mm) Travel Range
  • Maximum Optic Thickness:0.4" (10.2 mm)


  • Allows Precise Positioning of Optic within Lens Tube System
  • Internally and Externally SM3 (3.035"-40) Threaded
  • Mounts Ø3" (Ø75 mm) Optics in SM3RR Retaining Ring

This SM3-threaded (3.035"-40) adjustable-length lens tube allows Ø3" (Ø75 mm) 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.


Travel Range 0.89" (22.6 mm) with locking nut
1.00" (25.4 mm) without locking nut
Max Optic Thickness 0.400" (10.2 mm)



Our Mission is to accelerate the advancement of optical technology for precision measurements and their applications from the table tops of research laboratories to standard use in communication and high technology industries. Our aim is to serve our customers. Our hope is to create a place for highly skilled people in an open environment

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