Not sure who makes it, but there is supposedly a new system of binoculars out there in which to add magnification, you basically add lengths of lens. Additional cylinders (4" long each) screw onto the objective lens end--which are threaded. The system allows up to a total of 8 additional magnification increases. All magnification cylinders are different. They are as as follows: 1.2x,1.8x, 2.0x, 2.6x, 3.0x 3.4x, 4x and 5x, Different combinations of lenses can be screwed onto each other for variations in magnification. They are all compatible, as they are threaeded the same. There is a chart that comes in the case, to let the hunter know which combinations to use to get magnification they are looking for. I think like a 1.2x and a 2.0x and 2.6x gives you something like 6.25x. You can attach all 8, for a very powerful set of binoculars, and that's what's got me interested. And they are also supposed to be waterproof and very durable due to the threads have some sort of teflon fibers embedded in them.
Has anyone seen or heard of this system yet?