is a technique that was formerly used in chemical photography with which they could take macro pictures. is just flip the objective, this requires investors to get a ring (on one side that engages the camera and on the other thread that is to grab the goal where the filters would be placed) or sought life by tinkering (on the Internet can find a lot of "bricolage" to do this) Of course, the main drawback is that not being connected contacts, full automation are lost and many cameras can only shoot manual.
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