The advantage of using a two chambered roll becomes most apparent when loading. Since each chamber is light-tight, a loader only needs to load the feed side in darkness - once that chamber is secured, the remainder of the loading can take place in light. The small amount of film which is exposed on the take-up side would not be used for exposure under any design, and thus is not considered a significant loss of stock. Most two chambered axial magazines have fixed loop sizes, which adds some extra time to the loading procedure, but allows for magazines to be attached to the camera with minimal or no threading required. This can be a great advantage when filming requires reloading that takes only seconds.