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Description
Comparison/Showcase of the "Reversed Lens Technique".
As you can see you can get pretty close (I have no idea HOW close though, could be just some millimeters) this way.

How it works? Grab your camera with high-focal-length-lens on it, grab another lens (the lower the focal length, the higher the magnification!) (if it has an aperture-ring, it will save you some work, otherwise you have to keep the aperture open manually), set a high aperture (SMALL number! ) and just hold it front lens-to-front lens against your attached lens. I'm using cheap lenses for this, as it seems pretty rough. That's already it!
You also can use magnification glasses, but I doubt the results will be as good as with a lens.
Focusing happens through going closer/further away to/from the object.
You can of course go one step further and attach the lenses together, which should avoid additional light falling in from the sides.

FYI: The last, big image uses the same settings as the one right above it.

As you can see pretty well on this example, lighting could easily become quite complicated when you're that close. I was using a led-flashlight and the flash.

All images have been post processed, but only in camera raw and there was no cropping, just resizing (the small ones are about 13% of the original size, the big one about 30%)!

Setup:
Cam: Pentax K5
Lenses: Tamron 70-300 (about 130€ on amazon) and Rikenon 50 (used, about 30€-50€ on ebay)
I didn't use neither macro rings, nor close up lenses.
So it's a quite cheap setup, except of the cam.

First pic: 1:2
Last pic: 5:1 (haven't seen a regular macro lens that can do that)

I hope this inspires some of you guys out there to try something new
Don't be shy and tell me what you've shot using this technique.

Description
Comparison/Showcase of the "Reversed Lens Technique".
As you can see you can get pretty close (I have no idea HOW close though, could be just some millimeters) this way.

How it works? Grab your camera with high-focal-length-lens on it, grab another lens (the lower the focal length, the higher the magnification!) (if it has an aperture-ring, it will save you some work, otherwise you have to keep the aperture open manually), set a high aperture (SMALL number! ) and just hold it front lens-to-front lens against your attached lens. I'm using cheap lenses for this, as it seems pretty rough. That's already it!
You also can use magnification glasses, but I doubt the results will be as good as with a lens.
Focusing happens through going closer/further away to/from the object.
You can of course go one step further and attach the lenses together, which should avoid additional light falling in from the sides.

FYI: The last, big image uses the same settings as the one right above it.

As you can see pretty well on this example, lighting could easily become quite complicated when you're that close. I was using a led-flashlight and the flash.

All images have been post processed, but only in camera raw and there was no cropping, just resizing (the small ones are about 13% of the original size, the big one about 30%)!

Setup:
Cam: Pentax K5
Lenses: Tamron 70-300 (about 130€ on amazon) and Rikenon 50 (used, about 30€-50€ on ebay)
I didn't use neither macro rings, nor close up lenses.
So it's a quite cheap setup, except of the cam.

First pic: 1:2
Last pic: 5:1 (haven't seen a regular macro lens that can do that)

I hope this inspires some of you guys out there to try something new
Don't be shy and tell me what you've shot using this technique.