Mycro IIIA Subminiature camera (Late Version). COLLECTORS ITEM PLEASE NOTE THAT THE BACK LID IS NOT CLOSING PROPERLY. The Mycro IIIA was the last model in the Mycro line, switching back to the original 17.5mm paper backed rollfilm. Released in November 1953 in Japan. It has the same top housing as the Mycro Super 16, but it lacks the exposure counter and again has a covered red window in the back, similar to that of the Mycro I and II. The name Mycro IIIA is engraved in the top housing above the viewfinder. The lens is a fixed-focus 20mm f/4.5, and the aperture is set from 4.5 to 11 by an index placed under the barrel. The shutter has B, 25, 50, 100 settings selected by an index at the top, and the release lever is on the shutter casing itself. The film is advanced by a knob at the top left, as seen by the photographer. The back is hinged to the left and contains a single red window to control the advance.