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Try this link , it should help answer the questions.
Extension Tubes
Not sure how much you are trying to reduce your min. focusing distance. If you get the Kenko tubes and stack them all , the connection to the lens can be very loose and unstable especially on the 36mm tube.
Min focus distance of the lens is 12.63 feet
12mm extension tube - 12.5 ft MFD
20mm - 12.2 ft MFD
36mm extension tube - will give you approximately 11 ft MFD
There is a loss of light , can be as much as 3 stops depending on the size tube and if you stack them. Extension tubes are not as effective on telephoto lens as they are on the shorter lengths. You will also loose the ability to focus at infinity with the tubes.
Birdie
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