SEL50F18 Grinding Noise while Focusing

Started Oct 24, 2012 | Discussions thread
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iamDinesh
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SEL50F18 Grinding Noise while Focusing
Oct 24, 2012

Hello everyone,
Today I recieved my lSEL50F18 which I ordered from Wexphotographic . After mounting on my NEX 5N, the first thing I noticed was its grinding noise while focusing. If the aperture is fixed on 1.8 its not making any noise but while increasing f-stops to say 2.0 or 2.4 upto 22 the noise is increasing. Its doing this while in still mode only, in movie mode there is no issue. Also in still mode its making noise only in AF mode. In MF there is no noise whatsoever. In AF mode if the aperture is say 18, the blades will open and close making grinding noise.
Is this normal for this product or there is any issue with my lens only?

 iamDinesh's gear list:iamDinesh's gear list
Sony Alpha NEX-5N Sony E 18-55mm F3.5-5.6 OSS Sony E 16mm F2.8 Pancake Sony E 50mm F1.8 OSS +2 more
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