C-Mount Extension Tubes

Extension tubes fitted between the lens and the camera body enable you to focus much closer than normal. If you add an extension equivalent to the focal length of the lens, you will image at 1:1 . The distance between the camera sensor and the subject will be 4x the focal length of the lens, and the working distance will be 2x the focal length of the lens measured from the optical centre. Longer extensions for a given lens give greater magnification and shorter working distances, shorther extensions give less magnification and longer working distances.

Available in a set of four: 5mm, 10mm, 20mm, 40mm which gives 5mm to 75mm of extension in 5mm increments. Also available as individual tubes.