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Hasselblad film camera shutter button being released and then cranked once more to release shutter again. What you are hearing is the mirror being moved inside the camera to create an exposure on the film. Then, cranking a side lever to place the mirror in the same spot once more to create another exposure. Recorded using an Iphone 6s.

Sound recording of a broken speaker system emitting a whistling sound when it is turned on, without music playing. Recorded on an Zoom H4N.