| http://www.w3.org/ns/prov#value | - So the working distance of the bare lens is ~3.6 cm, and if you put on a Canon EF 25 II extension tube (which is actually 27mm long), your working distance is 0.9 cm, i.e. to get that almost 1:1 magnification, your subject is less than a finger-width from the front element.
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