We also offer extension tube and spacer ring kits, which contain a variety of thicknesses/lengths to allow for fine/coarse adjustment of the image distance without having to search for a single piece to provide the right distance.
For the construction of optical systems, Thorlabs offers lens tubes that accept Ø1/2", Ø1", Ø30 mm, Ø2", or Ø3" optics, each of which is equipped with an SM thread standard that depends on the tube diameter. Non-standard optics with diameters between 0.87" (22.0 mm) and 0.97" (24.6 mm) can be secured inside the tubes with C-Mount retaining rings. However, the 0.97" (24.6 mm) inner diameter of the C-Mount tubes is too small to accept Ø1" (Ø25.4 mm) or Ø25 mm (Ø0.98") optics.
The 1.20" (30.5 mm) outer diameter of the C-Mount extension tubes is the same as that of Thorlabs' Ø1" lens tubes, so the C-Mount tubes are compatible with all clamps and slip rings for Ø1" lens tubes. These rings fit between two C-Mount components and provide fine spacing adjustments. In addition, brass spacer rings that fit over external C-Mount threads are available in thicknesses from 0.25 mm (0.01") to 2.00 mm (0.08"). We also offer adjustable extension tubes for continuous adjustment up to 0.81" (20.6 mm). We offer C-Mount extension tubes in lengths from 5 mm to 100 mm for coarse adjustments of an optical system's length.
The decreased object distance increases the magnification of the image on the camera sensor while decreasing the depth of field. These extension tubes or spacers increase the image distance between the lens and the camera sensor. This allows the lens to focus on objects at shorter distances than would be possible without a spacer. The C-Mount extension tubes and spacer rings sold here are designed to be used as spacers with C-Mount and CS-Mount instruments such as Thorlabs' CCD/CMOS cameras and camera lenses. Extension Tubes and Spacers Compatible with C-Mount Lenses and Cameras.Increase the Magnification of C-Mount (1.00"-32) Camera Lenses.The introduction of an extension tube or spacer ring between a camera and a lens decreases the object distance and increases the image distance.
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