The M4 was the direct successor of the M3 & M3, with framelines for 35mm,
50mm, 90mm and 135mm lenses in a 0.72
It had the frame counter of the M3.
modifications introduced were (a) a different, angled film
advance lever, as well as slightly different rewind, self-timer and
frame selection levers, (b) a crank for rewinding the film, that
replaced the telescopic knob of the M3 and (c) a faster loading
system that did not need a removable spool. The M4-2 was
identical to the M4,but employed simpler production methods to lower
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