FAQ
Why does the SIGMA 50mm F1.4 DG DN | Art make a sound when the lens is shaken?
Lens
Products Information
The focusing lens group of SIGMA lenses equipped with the HLA (High-response Linear Actuator) motor is not fixed in position when the power to the lens is off, which means the lens may make a sound when shaken along the optical axis. This is completely normal.
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Contact
Please contact your nearest authorized SIGMA subsidiary / distributor for further information.