我拆鏡後發現，鏡片都乾淨，但對焦螺紋和內鏡筒壁有砂子，將砂子清潔乾淨後，重新潤滑螺紋，便完成這次的維修
The owner went to the beach and the lens fell down accidentally, then he found something wrong when turning the focusing ring.
When I took apart the lens, I saw sand on the focusing helicoids and the internal lens parts, the internal glasses were clean. So I cleaned all the sand and made a lubrication with new grease on the focusing helicoid.
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