I just handhold the binocular lens in contact with the cameras lens housing - see photo below. It works well probably doubling the power of the in camera macro. Of course different objective lenses would give more or less magnification. The binocular lens are also color corrected so color fringing is less of a problem than using a magnifying lens. The depth of field (DOF)seems to remain the same as with the in camera macro but the objects in the background are very nicely blurred much more so than with only the camera's macro. Definitely an improvement.
I also understand why these Bushnell binoculars were so cheap. Both objective lens are scratched. The scratches were unnoticeable when using it as a binocular and it doesn't seem to affect the photos either. I guess rather than throwing out flawed lenses they just created a bargain basement binocular.
Here's the objective lens of the binoculars and how it is hand held in front of the normal camera lens. Notice the lens has two elements or pieces of glass glued together. It also has a color corrected coating for truer colors and less color fringing.
You can see why I would prefer to use the Panasonic since it's much, much, lighter in weight, smaller, thinner and definitely more portable than the Canon especially when the lens adapter tube is attached to Canon so it can accept macro lenses.