I recently acquired two Nikkor lenses, both with Nikon branded copal 0 shutters. For one of the shutters, when I cock it with the preview open, it makes a buzzing noise that is intermittent if I jiggle the cocking lever.
My other Nikon shutter is entirely silent, doing the same thing, and makes a quick zip sound when I close the preview.
Both are accurate and fire reliably. Should I be concerned about the buzzing sound?
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