Macro Extension Tube for Canon EOS Model: 21040   In stock   SGD20.00

With the three 9mm, 16mm and 30mm extensions tubes you can achieve up to 8 different combinations of macro ranges. Also included in the package is one male and one female adapters, which are not meter-coupled, therefore manual focusing and manual aperture setting are required.

When mounted onto a 50mm lens, the magnification ratios are:
1) Only mounting tube without extension tube (1:0.34)
2) Mounting tubes + Tube 1 (1:0.48)
3) Mounting tubes + Tube 2 (1:0.62)
4) Mounting tubes + Tube 1&2 (1:0.76)
5) Mounting tubes + Tube 3 (1:0.90)
6) Mounting tubes + Tube 1&3 (1:1.04)
7) Mounting tubes + Tube 2&3 (1:1.18)
8) Mounting tubes + Tube 1,2&3 (1:1.32)

(just for info only, no guarantee of ratio accuracy)
 

The above picture showing:
(Left) 5 segments fixed together
(Right) 5 segments dismantled
 

Tips for Canon
As EF lens doesn't have a manual aperture ring, you can only shoot with aperture wide open. There's workaround thou:
1) Mount the EF Lens to the camera
2) Set the required aperture
3) Press and hold DOF preview button, at the same time remove the lens. Now the lens has close down its aperture.
4) Mount the lens to the extension tube, and to the camera.
5) Start shooting with the "closed" aperture.