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The Kenko 12mm Uniplus Tube DG (extension ring) is an accessory exclusively designed for use with standard AF lenses to shoot subjects at closer distance with higher magnification. Magnification ratio and focusing distance effect vary according to lens and tube combination. The longer the tube, the stronger the effect.
The Kenko Uniplus Tube rovides perfect coupling with automatic aperture, TTL metering and AE mechanism. AF support is dependent on your lens' maximum aperture. As a rule, the lens has to be set to f/5.6 or brighter in order for the camera's AF system to work. This DG Extension tube has upgraded "Gate-Array IC" circuitry to work better with DSLRs and some of the DSLR lenses.
The Kenko Uniplus 12 Extension Tube for Sony Alpha Cameras is an optics-free mechanical linkage which provides 12mm of space between any Sony Alpha camera and any lens made to fit Sony Alpha cameras. The Uniplus 12 is for moderately-close macro work, giving a 1:4 image reproduction ratio with a 50mm lens. This is the right choice if you'd like to photograph a 4x5" area of someone's face, for example.
All of your Sony Alpha camera's metering and exposure functions are retained, and though it is best to manually focus whenever working in the macro realm you can have the option of AF whenever there is sufficient light entering the optical path to properly activate the camera's focusing system.