Oh. Well I attached a teleconverter to the butt of my longest lens (100-400, min focus distance 1.8m) thus increasing the focal length of the lens to 200-800 (losing auto focus, as it becomes a f8-11lens... While retaining the min focus distance of 1.8m, effectively doubling the magnification factor) And I am in a school.. Tables and chairs are handy.. :p