Thread and needle release

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A thread and needle release is a feature found on some leaf shutters on the 1920s and 1930s, providing delayed action without implementing a proper self-timer. Its operation is extremely simple: the user sticks a threaded needle into a hole drilled in the shutter's front face, then trips the main release. The shutter does not open unless the thread is pulled, giving time for the user to position him/herself on the photograph.

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