At your disposal are three lens extension tubes of different lengths, each can be used alone or in combination(s) with one another resulting in the following choices 7mm, 14mm, 21mm, 28mm, 35mm, 42mm and 49mm. Because there are no glass lenses incorporated within the extension tubes, there will be no added distortion of any kind in the resulting pictures. This is certainly an instnace where less is more. You will get undistorted results with the Polaroid Macro Extension tubes , no matter how close you choose to get to your subject. Package Contents Camera Mount Coupling Adapter Lens Mount Coupling Adapter 7mm extansion tube 14mm extension tube 28mm extension tube