SOURCE: I bought a brand new 580 ex 11 flash unit. When I
The grinding noise is the zoom head trying to match the focal length of your lens. A brand new one should NOT grind. It should be silent. It sounds like you got the one that fell off the pallet during shipping. Exchange it for another one.
Testimonial: "lightspirit, Thanks very much for your response. It has be sent back for an exchange! Regards, Dantana"
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