Tamron 70-180mm operating noises (aperture blades)

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razorfish Contributing Member • Posts: 826
Tamron 70-180mm operating noises (aperture blades)

Got the lens new. AF itself is silent but if aperture is set darker than f2.8 I’ll hear the blades loudly opening and closing during AF. It’s very obvious in a quiet environment holding the camera to my eye, though cannot hear it much if there is noise around me and when using the LCD. Updating to latest firmware didn’t change anything. Is this just a normal thing with this lens, or did I get a bad copy? I’m a bit worried, especially since no reviews mentioned this behaviour. IQ seems fine BTW…

 razorfish's gear list:razorfish's gear list
Sony a7R III Sigma 35mm F1.2 DG DN Tamron 70-180mm F2.8 Di III VXD Sony FE 20mm F1.8G Tamron 150-500mm F5-6.7 Di III VC VXD +1 more
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