| Joined: | Sun Apr 1st, 2012 |
| Location: | Carthew, Cornwall, United Kingdom |
| Posts: | 6834 |
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Aluminium forms a thin oxide layer immediately it is exposed to oxygen - so all regular aluminium surfaces are "oxidised".
I would have thought the issue is more likely to be galvanic corrosion due to the use of other metals in contact with the aluminium or just a poor choice of material in the first place.
If indeed, that is the source of the noise - lenses aren't THAT difficult to disassemble, I'd be tempted to take it apart and clean / lubricate.
I agree it is a poor choice of material in this and other SWM lenses. I would have thought that a different metal or a plastic covering would be useful alternative.
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Still learning after all these years!
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