History and Technical Development
The earliest daguerreotype (invented 1839) photographic cameras did not have shutters, because the lack of sensitivity of the process and the small apertures of available lenses meant that exposure times were measured in many minutes. A photographer could easily control exposure time by removing and returning the camera lens' lens cap or plug.
However, as one increased sensitivity process replaced another and larger apertures lenses became available during the 1800s, exposure times shortened to seconds and then to fractions of seconds. Exposure timing control mechanisms became a necessary accessory and then a standard camera feature.
Read more about this topic: Focal-plane Shutter
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