Anyone here use lens-2-lens macro lens coupling? For those that don't know, it is where you take a second lens, reverse it, and press it against the lens already on the camera. Like I have 2 kit lenses with my D3400. A 18-55mm and a 70-300. If I have the 70-300mm on my camera set to 300mm and the 18-55mm reversed and set to 18mm I get a macro ratio of 16.667:1
Right now I'm just using some strong packing tape to wrap around the 2 lenses to hold them together. The reversed lens has an aperture adapter to adjust it. The light levels are ultra low and the amount of stabilization needed is almost impossible to get with my current setup.
Here's some info on how to do this stuff. I've been doing it for a while and had no clue there was actual gear made specifically for doing this until yesterday:
http://www.instructables.com/id/super-macro-photo-with-a-coupling-ring/Marco Calculators,
http://extreme-macro.co.uk/calculators/http://extreme-macro.co.uk/coupled-reverse-lens/#calculator 