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Over the years I've done five. 400mm f6.3 M42 Tokina telephoto whose aperture mechanism was seized up, with some of its blades buckled. Pentax Takumar 55mm f1.8 M42 that someone must have treated with WD40 or similar before putting it on eBay. I only noticed when the internal lens surfaces adjacent to the aperture mechanism became coated with oil droplets ...

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