Kenko extension tubes enable Canon DSLR owners to take extreme closeup shots of flowers, insects, etc. Simply screw the tube into your Canon camera lens mount. Tubes can be used singly or screwed together for extreme closeups (keep in mind that there will be light loss in such a case). Does not affect image sharpness since these are simply extension tubes without lenses. It changes the focal length of the camera. Tubes are in excellent condition. Local pickup or otherwise buyer pays additional postage