Mount a lens backwards to make a Macro Lens?

If you mount a normal lens backwards on a camera body, it becomes a great closeup Macro lens. If you think how a lens works, it’s no real surprise that this is the case.

A lens captures a large scene and projects it onto a small sensor (or film!) inside the camera. Therefore, by mounting it backwards, it does the opposite by projecting something small magnified onto the sensor.

{Click image for a higher resolution, click Flickr Link in caption to view photo on Flickr}
Moving Home - Garden Snail (Cornu aspersum) - D810, AF-D 50mm f/1.8 reverse mounted with a Nikon BR-2A Reverse Ring @ 50mm, f/22, ISO1000, 1/6sec - {Flickr Link}
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