Getting only 8 shots per roll can sometimes be a limitation, and hence a number of camera's take two shots within each 6x4 frame. This is acheieved by having TWO red windows on the back of the camera. The frame number is wound into the first window, a shot taken, and then the film wound on to the second window to take the second half of the frame.
This of course does take away one of 127's main advantages - the large negative. The exposed area is very similar to 35mm. However these are fun camera's, and its interesting to work with the vertical image format - because the frame is split the frame it now higher than it is wide.
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