My instructor lectured us about macro photography and she showed how to take macro photographs by using normal lens by reversing with out fixing it to the camera, but when I unfix the lens it shows nothing. I have a Nikon D5200 and I used 18-55mm lens. Luckily I used Canon 5D and I could take some amazing photos using the same lens?! What's wrong with Nikon D5200 and how can I overcome it?!