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Amazon.com : Meike 35mm F1.7 Manual Focus Prime Lens for Micro 4/3 MFT M4/3 Compatible with Olympus and Panasonic Mirrorless Cameras GH4 GH5 GH6 OM-1 : Electronics
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How to fix stiff focus ring on MF lens? : r/AskPhotography
Re: Used Sigma UC Zoom 70-210mm focus ring very stiff/grinding and autofocus motor getting stuck: Third Party Lens Talk Forum: Digital Photography Review
Soligor 28mm F/2 Red P Camera Lens Serial 17403501 Nikon F Mount | eBay
How to Fix a Stiff Focus Ring on a Nikon Lens | Techwalla
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Very Stiff focus ring In Ai-s Nikkor 85mm 1:1.4 - YouTube
Stiff focusing ring on a Biotar 58/2...? No problem!!!
Stiff focus ring in Carl Zeiss T* 50mm 1:1.7 C/Y RE-lube with #10 grease - YouTube
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Tamron SP 90mm f/2.8 macro, manual focus adaptall - stiff aperture ring?: Fujifilm X System / SLR Talk Forum: Digital Photography Review