Photographer Nicholas Sherlock—whose impressive 3D-printed DIY creations have appeared on PetaPixel before—is at it again. This time, he’s created a fully-functional 300mm extension tube, complete with contacts for aperture control and autofocus, so that he can go out and shoot insane 5x macro photos. Important to note up front that this isn’t just some hollow tube that attaches to a camera on one end and a lens on the other. It’s way more complicated than that. “Since Canon cameras control…