AF Extension tube set for Canon (12mm,20mm,36mm)
Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. Getting closer has the effect of magnifying your subject (making it appear larger in the viewfinder and in your pictures).
They are exceptionally useful for macro photography, enabling you to convert almost any lens into a macro lens at a fraction of the cost while maintaining its original optical quality.
This Autofocus Extension Tube Set (12/20/36mm) for Canon from KOOKA contains three tubes of different length, a 12 mm, 20 mm, and 36 mm, which can be used individually or in any combination to obtain the desired magnification.(An individual 25mm autofocus extension tube is available).