This is an accessory for the Lomography Konstruktor camera, which allows you to take "macro" shots, or in other words pictures of things REALLY close!
Simply thread your existing "Konstruktor" lens onto the front of the tube, then the whole tube onto the body!
I have created a lens tube extension that basically allows you to focus on objects much closer than with the standard Konstruktor setup.
For example the Konstruktor has a minimum focus range of .5 meters (Roughly 1.5 feet)
If you refer to the "comparison" image above you will see how big of a difference this lens makes when trying to focus in close on something. With the original lens setup you can see the whole bottle plus more, while with the tube extension, you can get the tiny little logo on the wine label to fill the whole frame.
With this Macro mod, you will be able to focus in on an object which is (at the closest) 80mm (3.14") away from the front of the camera lens.
One thing is that while the Konstruktors original lens setup allows you to focus from .5 meters to infinity, this modification is only for close-up work, meaning you can only focus on objects between 80mm, and 90mm away (3.14" and 3.54" away).