The camera's name is derived from the brass panel on the front which could be pivoted left or right to change the lens apertures. The largest aperture was selected when the butterfly-shaped panel was in its upright position as shown.

There is little information available about the camera itself; very few examples are known, but interestingly, within these few examples are several different variations. The version illustrated here is something of a 'deluxe' model, due to its polished mahogany exterior, flip-up frame finder, and ivory-tipped shutter release. Other examples have been noted with simpler controls, no frame finder, and even one with an ebonized wood exterior.

One rumor suggests that the cameras were offered as premiums when one purchased a box of French chocolates - quite a premium, given the scarcity of the camera today, and its desirability to collectors of both stereoscopic and antique cameras.