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Hi all,

My 75mm M APO-Summicron recently started giving a slight 'click' when I turn the aperture ring over the 1.2m to 1.5m range. It doesn't seem to affect image quality or focus in any way, it just feels like something is wrong/stuck inside the lens when focussing. The lens has not been exposed to sand/dust nor to bangs/blows.

Any experiences/ideas? Could it be the floating element? 

Thanks in advance!

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